diff --git a/.changeset/chilled-hotels-sniff.md b/.changeset/chilled-hotels-sniff.md
new file mode 100644
index 0000000000..8aa434d4b6
--- /dev/null
+++ b/.changeset/chilled-hotels-sniff.md
@@ -0,0 +1,5 @@
+---
+"effect": minor
+---
+
+Adds HashMap.HashMap.Entry type helper
diff --git a/.changeset/early-poems-explode.md b/.changeset/early-poems-explode.md
new file mode 100644
index 0000000000..9817262db3
--- /dev/null
+++ b/.changeset/early-poems-explode.md
@@ -0,0 +1,5 @@
+---
+"effect": minor
+---
+
+`Latch` implements `Effect<void>` with `.await` semantic
diff --git a/.changeset/fast-experts-melt.md b/.changeset/fast-experts-melt.md
new file mode 100644
index 0000000000..fb610b129b
--- /dev/null
+++ b/.changeset/fast-experts-melt.md
@@ -0,0 +1,5 @@
+---
+"effect": patch
+---
+
+fix Unify for Deferred
diff --git a/.changeset/healthy-dogs-judge.md b/.changeset/healthy-dogs-judge.md
new file mode 100644
index 0000000000..60164c55f0
--- /dev/null
+++ b/.changeset/healthy-dogs-judge.md
@@ -0,0 +1,5 @@
+---
+"effect": minor
+---
+
+Effect.mapAccum & Array.mapAccum preserve non-emptiness
diff --git a/.changeset/lemon-worms-return.md b/.changeset/lemon-worms-return.md
new file mode 100644
index 0000000000..75a5d4fea4
--- /dev/null
+++ b/.changeset/lemon-worms-return.md
@@ -0,0 +1,5 @@
+---
+"effect": minor
+---
+
+`Pool` is now a subtype of `Effect`, equivalent to `Pool.get`
diff --git a/.changeset/purple-beans-jog.md b/.changeset/purple-beans-jog.md
new file mode 100644
index 0000000000..b04f03b001
--- /dev/null
+++ b/.changeset/purple-beans-jog.md
@@ -0,0 +1,5 @@
+---
+"effect": minor
+---
+
+support ManagedRuntime in Effect.provide
diff --git a/.changeset/silly-glasses-deliver.md b/.changeset/silly-glasses-deliver.md
new file mode 100644
index 0000000000..a27d0df79f
--- /dev/null
+++ b/.changeset/silly-glasses-deliver.md
@@ -0,0 +1,5 @@
+---
+"effect": patch
+---
+
+move ManagedRuntime.TypeId to fix circular imports
diff --git a/.changeset/smart-fishes-sit.md b/.changeset/smart-fishes-sit.md
new file mode 100644
index 0000000000..4b2f2750f3
--- /dev/null
+++ b/.changeset/smart-fishes-sit.md
@@ -0,0 +1,5 @@
+---
+"effect": minor
+---
+
+`ManagedRuntime<R, E>` is subtype of `Effect<Runtime<R>, E, never>`
diff --git a/.changeset/tricky-oranges-melt.md b/.changeset/tricky-oranges-melt.md
new file mode 100644
index 0000000000..2d31047195
--- /dev/null
+++ b/.changeset/tricky-oranges-melt.md
@@ -0,0 +1,5 @@
+---
+"effect": minor
+---
+
+Add an `isRegExp` type guard
diff --git a/.changeset/wicked-bears-flow.md b/.changeset/wicked-bears-flow.md
new file mode 100644
index 0000000000..1781cd7b07
--- /dev/null
+++ b/.changeset/wicked-bears-flow.md
@@ -0,0 +1,6 @@
+---
+"effect": minor
+---
+
+`Resource<A, E>` is subtype of `Effect<A, E>`.
+`ScopedRed<A>` is subtype of `Effect<A>`.
diff --git a/packages/effect/dtslint/Array.ts b/packages/effect/dtslint/Array.ts
index 53ea255d1c..682abf120d 100644
--- a/packages/effect/dtslint/Array.ts
+++ b/packages/effect/dtslint/Array.ts
@@ -1504,3 +1504,24 @@ pipe(
     _n // $ExpectType 1 | 2
   ) => "a" as const)
 )
+
+// -------------------------------------------------------------------------------------
+// mapAccum
+// -------------------------------------------------------------------------------------
+
+// $ExpectType [state: number, mappedArray: string[]]
+Array.mapAccum(strings, 0, (s, a, i) => [s + i, a])
+
+// $ExpectType [state: number, mappedArray: [string, ...string[]]]
+Array.mapAccum(nonEmptyReadonlyStrings, 0, (s, a, i) => [s + i, a])
+
+// $ExpectType [state: number, mappedArray: string[]]
+pipe(
+  strings,
+  Array.mapAccum(0, (s, a, i) => [s + i, a])
+)
+// $ExpectType [state: number, mappedArray: [string, ...string[]]]
+pipe(
+  nonEmptyReadonlyStrings,
+  Array.mapAccum(0, (s, a, i) => [s + i, a])
+)
diff --git a/packages/effect/dtslint/Effect.ts b/packages/effect/dtslint/Effect.ts
index caeaea1b59..27e1f45659 100644
--- a/packages/effect/dtslint/Effect.ts
+++ b/packages/effect/dtslint/Effect.ts
@@ -1263,3 +1263,28 @@ pipe(
     ) => "b" as const
   )
 )
+
+// -------------------------------------------------------------------------------------
+// mapAccum
+// -------------------------------------------------------------------------------------
+
+declare const nonEmptyReadonlyStrings: NonEmptyReadonlyArray<string>
+declare const strings: Array<string>
+
+// $ExpectType Effect<[number, string[]], never, never>
+Effect.mapAccum(strings, 0, (s, a, i) => Effect.succeed([s + i, a]))
+
+// $ExpectType Effect<[number, [string, ...string[]]], never, never>
+Effect.mapAccum(nonEmptyReadonlyStrings, 0, (s, a, i) => Effect.succeed([s + i, a]))
+
+// $ExpectType Effect<[number, string[]], never, never>
+pipe(
+  strings,
+  Effect.mapAccum(0, (s, a, i) => Effect.succeed([s + i, a]))
+)
+
+// $ExpectType Effect<[number, [string, ...string[]]], never, never>
+pipe(
+  nonEmptyReadonlyStrings,
+  Effect.mapAccum(0, (s, a, i) => Effect.succeed([s + i, a]))
+)
diff --git a/packages/effect/dtslint/HashMap.ts b/packages/effect/dtslint/HashMap.ts
index 00ed98ce10..ed8c53bc8d 100644
--- a/packages/effect/dtslint/HashMap.ts
+++ b/packages/effect/dtslint/HashMap.ts
@@ -1,6 +1,7 @@
-import { pipe } from "effect/Function"
+import { hole, pipe } from "effect/Function"
 import * as HashMap from "effect/HashMap"
 import * as Predicate from "effect/Predicate"
+import type * as Types from "effect/Types"
 
 declare const hmLiterals: HashMap.HashMap<"k", "v">
 declare const numbers: HashMap.HashMap<string, number>
@@ -23,6 +24,13 @@ export type K = HashMap.HashMap.Key<typeof hmLiterals>
 // $ExpectType "v"
 export type V = HashMap.HashMap.Value<typeof hmLiterals>
 
+// -------------------------------------------------------------------------------------
+// HashMap.Entry
+// -------------------------------------------------------------------------------------
+
+// $ExpectType ["k", "v"]
+hole<Types.Simplify<HashMap.HashMap.Entry<typeof hmLiterals>>>()
+
 // -------------------------------------------------------------------------------------
 // filter
 // -------------------------------------------------------------------------------------
diff --git a/packages/effect/dtslint/Predicate.ts b/packages/effect/dtslint/Predicate.ts
index d7d3a4db25..eee9006e29 100644
--- a/packages/effect/dtslint/Predicate.ts
+++ b/packages/effect/dtslint/Predicate.ts
@@ -194,6 +194,13 @@ if (Predicate.isTupleOfAtLeast(unknowns, 3)) {
   unknowns
 }
 
+// -------------------------------------------------------------------------------------
+// isRegExp
+// -------------------------------------------------------------------------------------
+
+// $ExpectType RegExp[]
+unknowns.filter(Predicate.isRegExp)
+
 // -------------------------------------------------------------------------------------
 // compose
 // -------------------------------------------------------------------------------------
diff --git a/packages/effect/dtslint/Unify.ts b/packages/effect/dtslint/Unify.ts
index 8a122c7e87..32185fdbe6 100644
--- a/packages/effect/dtslint/Unify.ts
+++ b/packages/effect/dtslint/Unify.ts
@@ -4,11 +4,15 @@ import * as Either from "effect/Either"
 import type * as Exit from "effect/Exit"
 import type * as Fiber from "effect/Fiber"
 import type * as FiberRef from "effect/FiberRef"
+import type * as ManagedRuntime from "effect/ManagedRuntime"
 import type * as Micro from "effect/Micro"
 import type * as Option from "effect/Option"
+import type * as Pool from "effect/Pool"
 import type * as Queue from "effect/Queue"
 import type * as RcRef from "effect/RcRef"
 import type * as Ref from "effect/Ref"
+import type * as Resource from "effect/Resource"
+import type * as ScopedRef from "effect/ScopedRef"
 import type * as Stream from "effect/Stream"
 import type * as SubscriptionRef from "effect/SubscriptionRef"
 import type * as SynchronizedRef from "effect/SynchronizedRef"
@@ -98,7 +102,11 @@ export type RuntimeFiberUnify = Unify.Unify<
   | Fiber.RuntimeFiber<1, 2>
   | Fiber.RuntimeFiber<"a", "b">
 >
-
+// $ExpectType ManagedRuntime<1, 2> | ManagedRuntime<"a", "b">
+export type ManagedRuntimeUnify = Unify.Unify<
+  | ManagedRuntime.ManagedRuntime<1, 2>
+  | ManagedRuntime.ManagedRuntime<"a", "b">
+>
 // $ExpectType Queue<1> | Queue<"a">
 export type QueueUnify = Unify.Unify<
   | Queue.Queue<1>
@@ -109,34 +117,64 @@ export type DequeueUnify = Unify.Unify<
   | Queue.Dequeue<1>
   | Queue.Dequeue<"a">
 >
+// $ExpectType Pool<1, 2> | Pool<"a", "b" | "c">
+export type PoolUnify = Unify.Unify<
+  | Pool.Pool<1, 2>
+  | Pool.Pool<"a", "b">
+  | Pool.Pool<"a", "c">
+>
 
-// $ExpectType 0 | Option<string | number> | Ref<1> | SynchronizedRef<1> | SubscriptionRef<1> | Deferred<1, 2> | Deferred<"a", "b"> | Fiber<"a" | 1, "b" | 2> | RuntimeFiber<"a" | 1, "b" | 2> | Queue<1> | Queue<"a"> | Dequeue<"a" | 1> | Ref<"A"> | SynchronizedRef<"A"> | SubscriptionRef<"A"> | FiberRef<12> | FiberRef<"a2"> | Either<1 | "A", 0 | "E"> | Effect<1 | "A", 0 | "E", "R" | "R1"> | RcRef<1 | "A", 0 | "E">
+// $ExpectType ScopedRef<1> | ScopedRef<"a">
+export type ScopedRefUnify = Unify.Unify<
+  | ScopedRef.ScopedRef<1>
+  | ScopedRef.ScopedRef<"a">
+>
+// $ExpectType Resource<1, never> | Resource<never, 2> | Resource<1, 2> | Resource<"a", "b"> | Resource<any, any>
+export type ResourceUnify = Unify.Unify<
+  | Resource.Resource<1>
+  | Resource.Resource<never, 2>
+  | Resource.Resource<1, 2>
+  | Resource.Resource<"a", "b">
+  | Resource.Resource<any, any>
+>
+
+// $ExpectType 0 | Option<string | number> | Ref<1> | Ref<"a"> | SynchronizedRef<1> | SynchronizedRef<"a"> | SubscriptionRef<1> | SubscriptionRef<"a"> | Deferred<"a", "b"> | FiberRef<1> | FiberRef<"a"> | ManagedRuntime<"a", "b"> | Queue<1> | Queue<"a"> | Dequeue<"a" | 1> | Pool<1, 2> | Pool<"a", "b" | "c"> | ScopedRef<1> | ScopedRef<"a"> | Resource<"a", "b"> | Deferred<1, 0> | Resource<1, 0> | Latch | ManagedRuntime<1, 0> | RcRef<"a" | 1, 0 | "b"> | Fiber<"a" | 1, 0 | "b"> | RuntimeFiber<"a" | 1, 0 | "b"> | Either<"a" | 1, 0 | "b"> | Effect<"a" | 1, 0 | "b", "R" | "R1">
 export type AllUnify = Unify.Unify<
   | Either.Either<1, 0>
-  | Either.Either<"A", "E">
+  | Either.Either<"a", "b">
   | Option.Option<number>
   | Option.Option<string>
-  | Effect.Effect<"A", "E", "R">
+  | Effect.Effect<"a", "b", "R">
   | Effect.Effect<1, 0, "R1">
   | Ref.Ref<1>
-  | Ref.Ref<"A">
+  | Ref.Ref<"a">
   | SynchronizedRef.SynchronizedRef<1>
-  | SynchronizedRef.SynchronizedRef<"A">
+  | SynchronizedRef.SynchronizedRef<"a">
   | SubscriptionRef.SubscriptionRef<1>
-  | SubscriptionRef.SubscriptionRef<"A">
+  | SubscriptionRef.SubscriptionRef<"a">
   | RcRef.RcRef<1, 0>
-  | RcRef.RcRef<"A", "E">
-  | Deferred.Deferred<1, 2>
+  | RcRef.RcRef<"a", "b">
+  | Deferred.Deferred<1, 0>
   | Deferred.Deferred<"a", "b">
-  | FiberRef.FiberRef<12>
-  | FiberRef.FiberRef<"a2">
-  | Fiber.Fiber<1, 2>
+  | FiberRef.FiberRef<1>
+  | FiberRef.FiberRef<"a">
+  | Fiber.Fiber<1, 0>
   | Fiber.Fiber<"a", "b">
-  | Fiber.RuntimeFiber<1, 2>
+  | Fiber.RuntimeFiber<1, 0>
   | Fiber.RuntimeFiber<"a", "b">
   | Queue.Queue<1>
   | Queue.Queue<"a">
   | Queue.Dequeue<1>
   | Queue.Dequeue<"a">
+  | Pool.Pool<1, 2>
+  | Pool.Pool<"a", "b">
+  | Pool.Pool<"a", "c">
+  | ScopedRef.ScopedRef<1>
+  | ScopedRef.ScopedRef<"a">
+  | Resource.Resource<1, 0>
+  | Resource.Resource<"a", "b">
+  | Effect.Latch
+  | ManagedRuntime.ManagedRuntime<1, 0>
+  | ManagedRuntime.ManagedRuntime<"a", "b">
   | 0
 >
diff --git a/packages/effect/src/Array.ts b/packages/effect/src/Array.ts
index 6867785277..334cbbfb19 100644
--- a/packages/effect/src/Array.ts
+++ b/packages/effect/src/Array.ts
@@ -2859,11 +2859,15 @@ export const join: {
  * @category folding
  */
 export const mapAccum: {
-  <S, A, B>(
+  <S, A, B, I extends Iterable<A> = Iterable<A>>(
     s: S,
-    f: (s: S, a: A, i: number) => readonly [S, B]
-  ): (self: Iterable<A>) => [state: S, mappedArray: Array<B>]
-  <S, A, B>(self: Iterable<A>, s: S, f: (s: S, a: A, i: number) => readonly [S, B]): [state: S, mappedArray: Array<B>]
+    f: (s: S, a: ReadonlyArray.Infer<I>, i: number) => readonly [S, B]
+  ): (self: I) => [state: S, mappedArray: ReadonlyArray.With<I, B>]
+  <S, A, B, I extends Iterable<A> = Iterable<A>>(
+    self: I,
+    s: S,
+    f: (s: S, a: ReadonlyArray.Infer<I>, i: number) => readonly [S, B]
+  ): [state: S, mappedArray: ReadonlyArray.With<I, B>]
 } = dual(
   3,
   <S, A, B>(self: Iterable<A>, s: S, f: (s: S, a: A, i: number) => [S, B]): [state: S, mappedArray: Array<B>] => {
diff --git a/packages/effect/src/Deferred.ts b/packages/effect/src/Deferred.ts
index 10a8cc13d9..e4feb97daa 100644
--- a/packages/effect/src/Deferred.ts
+++ b/packages/effect/src/Deferred.ts
@@ -52,7 +52,7 @@ export interface Deferred<in out A, in out E = never> extends Effect.Effect<A, E
  * @since 3.8.0
  */
 export interface DeferredUnify<A extends { [Unify.typeSymbol]?: any }> extends Effect.EffectUnify<A> {
-  Deferred?: () => Extract<A[Unify.typeSymbol], Deferred<any>>
+  Deferred?: () => Extract<A[Unify.typeSymbol], Deferred<any, any>>
 }
 
 /**
diff --git a/packages/effect/src/Effect.ts b/packages/effect/src/Effect.ts
index 090039deb2..f9929c4312 100644
--- a/packages/effect/src/Effect.ts
+++ b/packages/effect/src/Effect.ts
@@ -38,6 +38,7 @@ import * as _runtime from "./internal/runtime.js"
 import * as _schedule from "./internal/schedule.js"
 import type * as Layer from "./Layer.js"
 import type { LogLevel } from "./LogLevel.js"
+import type * as ManagedRuntime from "./ManagedRuntime.js"
 import type * as Metric from "./Metric.js"
 import type * as MetricLabel from "./MetricLabel.js"
 import type * as Option from "./Option.js"
@@ -2364,15 +2365,15 @@ export const map: {
  * @category mapping
  */
 export const mapAccum: {
-  <S, A, B, E, R>(
+  <S, A, B, E, R, I extends Iterable<A> = Iterable<A>>(
     zero: S,
-    f: (s: S, a: A, i: number) => Effect<readonly [S, B], E, R>
-  ): (elements: Iterable<A>) => Effect<[S, Array<B>], E, R>
-  <A, S, B, E, R>(
-    elements: Iterable<A>,
+    f: (s: S, a: RA.ReadonlyArray.Infer<I>, i: number) => Effect<readonly [S, B], E, R>
+  ): (elements: I) => Effect<[S, RA.ReadonlyArray.With<I, B>], E, R>
+  <A, S, B, E, R, I extends Iterable<A> = Iterable<A>>(
+    elements: I,
     zero: S,
-    f: (s: S, a: A, i: number) => Effect<readonly [S, B], E, R>
-  ): Effect<[S, Array<B>], E, R>
+    f: (s: S, a: RA.ReadonlyArray.Infer<I>, i: number) => Effect<readonly [S, B], E, R>
+  ): Effect<[S, RA.ReadonlyArray.With<I, B>], E, R>
 } = effect.mapAccum
 
 /**
@@ -3330,12 +3331,19 @@ export const provide: {
   ): <A, E, R>(self: Effect<A, E, R>) => Effect<A, E2 | E, RIn | Exclude<R, ROut>>
   <R2>(context: Context.Context<R2>): <A, E, R>(self: Effect<A, E, R>) => Effect<A, E, Exclude<R, R2>>
   <R2>(runtime: Runtime.Runtime<R2>): <A, E, R>(self: Effect<A, E, R>) => Effect<A, E, Exclude<R, R2>>
+  <E2, R2>(
+    managedRuntime: ManagedRuntime.ManagedRuntime<R2, E2>
+  ): <A, E, R>(self: Effect<A, E, R>) => Effect<A, E | E2, Exclude<R, R2>>
   <A, E, R, ROut, E2, RIn>(
     self: Effect<A, E, R>,
     layer: Layer.Layer<ROut, E2, RIn>
   ): Effect<A, E | E2, RIn | Exclude<R, ROut>>
   <A, E, R, R2>(self: Effect<A, E, R>, context: Context.Context<R2>): Effect<A, E, Exclude<R, R2>>
   <A, E, R, R2>(self: Effect<A, E, R>, runtime: Runtime.Runtime<R2>): Effect<A, E, Exclude<R, R2>>
+  <A, E, E2, R, R2>(
+    self: Effect<A, E, R>,
+    runtime: ManagedRuntime.ManagedRuntime<R2, E2>
+  ): Effect<A, E | E2, Exclude<R, R2>>
 } = layer.effect_provide
 
 /**
@@ -5408,7 +5416,7 @@ export const makeSemaphore: (permits: number) => Effect<Semaphore> = circular.ma
  * @category latch
  * @since 3.8.0
  */
-export interface Latch {
+export interface Latch extends Effect<void> {
   /** open the latch, releasing all fibers waiting on it */
   readonly open: Effect<void>
   /** release all fibers waiting on the latch, without opening it */
@@ -5419,6 +5427,26 @@ export interface Latch {
   readonly close: Effect<void>
   /** only run the given effect when the latch is open */
   readonly whenOpen: <A, E, R>(self: Effect<A, E, R>) => Effect<A, E, R>
+
+  readonly [Unify.typeSymbol]?: unknown
+  readonly [Unify.unifySymbol]?: LatchUnify<this>
+  readonly [Unify.ignoreSymbol]?: LatchUnifyIgnore
+}
+
+/**
+ * @category models
+ * @since 3.8.0
+ */
+export interface LatchUnify<A extends { [Unify.typeSymbol]?: any }> extends EffectUnify<A> {
+  Latch?: () => Latch
+}
+
+/**
+ * @category models
+ * @since 3.8.0
+ */
+export interface LatchUnifyIgnore extends EffectUnifyIgnore {
+  Effect?: true
 }
 
 /**
diff --git a/packages/effect/src/HashMap.ts b/packages/effect/src/HashMap.ts
index 47f3597112..f5a881f727 100644
--- a/packages/effect/src/HashMap.ts
+++ b/packages/effect/src/HashMap.ts
@@ -66,6 +66,22 @@ export declare namespace HashMap {
    * @category type-level
    */
   export type Value<T extends HashMap<any, any>> = [T] extends [HashMap<infer _K, infer _V>] ? _V : never
+
+  /**
+   * This type-level utility extracts the entry type `[K, V]` from a `HashMap<K, V>` type.
+   *
+   * @example
+   * import { HashMap } from "effect"
+   *
+   * declare const hm: HashMap.HashMap<string, number>
+   *
+   * // $ExpectType [string, number]
+   * type V = HashMap.HashMap.Entry<typeof hm>
+   *
+   * @since 3.9.0
+   * @category type-level
+   */
+  export type Entry<T extends HashMap<any, any>> = [Key<T>, Value<T>]
 }
 
 /**
diff --git a/packages/effect/src/ManagedRuntime.ts b/packages/effect/src/ManagedRuntime.ts
index d66b50dbd9..0ab054c5db 100644
--- a/packages/effect/src/ManagedRuntime.ts
+++ b/packages/effect/src/ManagedRuntime.ts
@@ -5,9 +5,32 @@ import type * as Effect from "./Effect.js"
 import type * as Exit from "./Exit.js"
 import type * as Fiber from "./Fiber.js"
 import * as internal from "./internal/managedRuntime.js"
+import * as circular from "./internal/managedRuntime/circular.js"
 import type * as Layer from "./Layer.js"
-import type { Pipeable } from "./Pipeable.js"
 import type * as Runtime from "./Runtime.js"
+import type * as Unify from "./Unify.js"
+
+/**
+ * @since 3.9.0
+ * @category symbol
+ */
+export const TypeId: unique symbol = circular.TypeId as TypeId
+
+/**
+ * @since 3.9.0
+ * @category symbol
+ */
+export type TypeId = typeof TypeId
+
+/**
+ * Checks if the provided argument is a `ManagedRuntime`.
+ *
+ * @param input - The value to be checked if it is a `ManagedRuntime`.
+
+ * @since 3.9.0
+ * @category guards
+ */
+export const isManagedRuntime: (input: unknown) => input is ManagedRuntime<unknown, unknown> = internal.isManagedRuntime
 
 /**
  * @since 3.4.0
@@ -29,7 +52,8 @@ export declare namespace ManagedRuntime {
  * @since 2.0.0
  * @category models
  */
-export interface ManagedRuntime<in R, out ER> extends Pipeable {
+export interface ManagedRuntime<in R, out ER> extends Effect.Effect<Runtime.Runtime<R>, ER> {
+  readonly [TypeId]: TypeId
   readonly memoMap: Layer.MemoMap
   readonly runtimeEffect: Effect.Effect<Runtime.Runtime<R>, ER>
   readonly runtime: () => Promise<Runtime.Runtime<R>>
@@ -103,6 +127,26 @@ export interface ManagedRuntime<in R, out ER> extends Pipeable {
    * Dispose of the resources associated with the runtime.
    */
   readonly disposeEffect: Effect.Effect<void, never, never>
+
+  readonly [Unify.typeSymbol]?: unknown
+  readonly [Unify.unifySymbol]?: ManagedRuntimeUnify<this>
+  readonly [Unify.ignoreSymbol]?: ManagedRuntimeUnifyIgnore
+}
+
+/**
+ * @category models
+ * @since 3.9.0
+ */
+export interface ManagedRuntimeUnify<A extends { [Unify.typeSymbol]?: any }> extends Effect.EffectUnify<A> {
+  ManagedRuntime?: () => Extract<A[Unify.typeSymbol], ManagedRuntime<any, any>>
+}
+
+/**
+ * @category models
+ * @since 3.9.0
+ */
+export interface ManagedRuntimeUnifyIgnore extends Effect.EffectUnifyIgnore {
+  Effect?: true
 }
 
 /**
diff --git a/packages/effect/src/Pool.ts b/packages/effect/src/Pool.ts
index 59383ee57f..fd705d28c9 100644
--- a/packages/effect/src/Pool.ts
+++ b/packages/effect/src/Pool.ts
@@ -7,6 +7,7 @@ import * as internal from "./internal/pool.js"
 import type { Pipeable } from "./Pipeable.js"
 import type * as Scope from "./Scope.js"
 import type * as Types from "./Types.js"
+import type * as Unify from "./Unify.js"
 
 /**
  * @since 2.0.0
@@ -28,7 +29,7 @@ export type PoolTypeId = typeof PoolTypeId
  * @since 2.0.0
  * @category models
  */
-export interface Pool<in out A, out E = never> extends Pool.Variance<A, E>, Pipeable {
+export interface Pool<in out A, out E = never> extends Pool.Variance<A, E>, Effect.Effect<A, E, Scope.Scope>, Pipeable {
   /**
    * Retrieves an item from the pool in a scoped effect. Note that if
    * acquisition fails, then the returned effect will fail for that same reason.
@@ -42,6 +43,30 @@ export interface Pool<in out A, out E = never> extends Pool.Variance<A, E>, Pipe
    * than eagerly.
    */
   invalidate(item: A): Effect.Effect<void>
+
+  readonly [Unify.typeSymbol]?: unknown
+  readonly [Unify.unifySymbol]?: PoolUnify<this>
+  readonly [Unify.ignoreSymbol]?: PoolUnifyIgnore
+}
+
+/**
+ * @category models
+ * @since 3.9.0
+ */
+export interface PoolUnify<A extends { [Unify.typeSymbol]?: any }> extends Effect.EffectUnify<A> {
+  Pool?: () => Extract<A[Unify.typeSymbol], Pool<any, any>> extends Pool<infer A0, infer _E0> | infer _ ?
+    A0 extends any ? Extract<A[Unify.typeSymbol], Pool<A0, any>> extends Pool<A0, infer E1> ? Pool<A0, E1>
+      : never
+    : never :
+    never
+}
+
+/**
+ * @category models
+ * @since 3.9.0
+ */
+export interface PoolUnifyIgnore extends Effect.EffectUnifyIgnore {
+  Effect?: true
 }
 
 /**
diff --git a/packages/effect/src/Predicate.ts b/packages/effect/src/Predicate.ts
index 1646a1a9c3..0fbc6f3bf8 100644
--- a/packages/effect/src/Predicate.ts
+++ b/packages/effect/src/Predicate.ts
@@ -665,6 +665,22 @@ export const isPromiseLike = (
   input: unknown
 ): input is PromiseLike<unknown> => hasProperty(input, "then") && isFunction(input.then)
 
+/**
+ * Tests if a value is a `RegExp`.
+ *
+ * @param input - The value to test.
+ *
+ * @example
+ * import { Predicate } from "effect"
+ *
+ * assert.deepStrictEqual(Predicate.isRegExp(/a/), true)
+ * assert.deepStrictEqual(Predicate.isRegExp("a"), false)
+ *
+ * @category guards
+ * @since 3.9.0
+ */
+export const isRegExp = (input: unknown): input is RegExp => input instanceof RegExp
+
 /**
  * @since 2.0.0
  */
diff --git a/packages/effect/src/Queue.ts b/packages/effect/src/Queue.ts
index 2951729717..e9478966ff 100644
--- a/packages/effect/src/Queue.ts
+++ b/packages/effect/src/Queue.ts
@@ -64,7 +64,7 @@ export type BackingQueueTypeId = typeof BackingQueueTypeId
  * @since 2.0.0
  * @category models
  */
-export interface Queue<in out A> extends Enqueue<A>, Dequeue<A>, Pipeable {
+export interface Queue<in out A> extends Enqueue<A>, Dequeue<A> {
   /** @internal */
   readonly queue: BackingQueue<A>
   /** @internal */
@@ -134,7 +134,7 @@ export interface Enqueue<in A> extends Queue.EnqueueVariance<A>, BaseQueue, Pipe
  * @since 2.0.0
  * @category models
  */
-export interface Dequeue<out A> extends Effect.Effect<A>, Queue.DequeueVariance<A>, BaseQueue, Pipeable {
+export interface Dequeue<out A> extends Effect.Effect<A>, Queue.DequeueVariance<A>, BaseQueue {
   /**
    * Takes the oldest value in the queue. If the queue is empty, this will return
    * a computation that resumes when an item has been added to the queue.
diff --git a/packages/effect/src/RegExp.ts b/packages/effect/src/RegExp.ts
index 36ce61d6a2..374a2d5b49 100644
--- a/packages/effect/src/RegExp.ts
+++ b/packages/effect/src/RegExp.ts
@@ -3,6 +3,23 @@
  *
  * @since 2.0.0
  */
+import * as predicate from "./Predicate.js"
+
+/**
+ * Tests if a value is a `RegExp`.
+ *
+ * @param input - The value to test.
+ *
+ * @example
+ * import { RegExp } from "effect"
+ *
+ * assert.deepStrictEqual(RegExp.isRegExp(/a/), true)
+ * assert.deepStrictEqual(RegExp.isRegExp("a"), false)
+ *
+ * @category guards
+ * @since 3.9.0
+ */
+export const isRegExp: (input: unknown) => input is RegExp = predicate.isRegExp
 
 /**
  * Escapes special characters in a regular expression pattern.
diff --git a/packages/effect/src/Resource.ts b/packages/effect/src/Resource.ts
index dc9af2a864..1f9713e770 100644
--- a/packages/effect/src/Resource.ts
+++ b/packages/effect/src/Resource.ts
@@ -8,6 +8,7 @@ import type * as Schedule from "./Schedule.js"
 import type * as Scope from "./Scope.js"
 import type * as ScopedRef from "./ScopedRef.js"
 import type * as Types from "./Types.js"
+import type * as Unify from "./Unify.js"
 
 /**
  * @since 2.0.0
@@ -28,11 +29,31 @@ export type ResourceTypeId = typeof ResourceTypeId
  * @since 2.0.0
  * @category models
  */
-export interface Resource<in out A, in out E = never> extends Resource.Variance<A, E> {
+export interface Resource<in out A, in out E = never> extends Effect.Effect<A, E>, Resource.Variance<A, E> {
   /** @internal */
   readonly scopedRef: ScopedRef.ScopedRef<Exit.Exit<A, E>>
   /** @internal */
   readonly acquire: Effect.Effect<A, E, Scope.Scope>
+
+  readonly [Unify.typeSymbol]?: unknown
+  readonly [Unify.unifySymbol]?: ResourceUnify<this>
+  readonly [Unify.ignoreSymbol]?: ResourceUnifyIgnore
+}
+
+/**
+ * @category models
+ * @since 3.9.0
+ */
+export interface ResourceUnify<A extends { [Unify.typeSymbol]?: any }> extends Effect.EffectUnify<A> {
+  Resource?: () => Extract<A[Unify.typeSymbol], Resource<any, any>>
+}
+
+/**
+ * @category models
+ * @since 3.9.0
+ */
+export interface ResourceUnifyIgnore extends Effect.EffectUnifyIgnore {
+  Effect?: true
 }
 
 /**
diff --git a/packages/effect/src/ScopedRef.ts b/packages/effect/src/ScopedRef.ts
index cc46efb205..8d44654afb 100644
--- a/packages/effect/src/ScopedRef.ts
+++ b/packages/effect/src/ScopedRef.ts
@@ -8,6 +8,7 @@ import type { Pipeable } from "./Pipeable.js"
 import type * as Scope from "./Scope.js"
 import type * as Synchronized from "./SynchronizedRef.js"
 import type * as Types from "./Types.js"
+import type * as Unify from "./Unify.js"
 
 /**
  * @since 2.0.0
@@ -31,9 +32,29 @@ export type ScopedRefTypeId = typeof ScopedRefTypeId
  * @since 2.0.0
  * @category models
  */
-export interface ScopedRef<in out A> extends ScopedRef.Variance<A>, Pipeable {
+export interface ScopedRef<in out A> extends Effect.Effect<A>, ScopedRef.Variance<A>, Pipeable {
   /** @internal */
   readonly ref: Synchronized.SynchronizedRef<readonly [Scope.Scope.Closeable, A]>
+
+  readonly [Unify.typeSymbol]?: unknown
+  readonly [Unify.unifySymbol]?: ScopedRefUnify<this>
+  readonly [Unify.ignoreSymbol]?: ScopedRefUnifyIgnore
+}
+
+/**
+ * @category models
+ * @since 3.9.0
+ */
+export interface ScopedRefUnify<A extends { [Unify.typeSymbol]?: any }> extends Effect.EffectUnify<A> {
+  ScopedRef?: () => Extract<A[Unify.typeSymbol], ScopedRef<any>>
+}
+
+/**
+ * @category models
+ * @since 3.9.0
+ */
+export interface ScopedRefUnifyIgnore extends Effect.EffectUnifyIgnore {
+  Effect?: true
 }
 
 /**
diff --git a/packages/effect/src/Unify.ts b/packages/effect/src/Unify.ts
index dc6cdd26c5..a024a5b19c 100644
--- a/packages/effect/src/Unify.ts
+++ b/packages/effect/src/Unify.ts
@@ -34,26 +34,21 @@ export declare const ignoreSymbol: unique symbol
  */
 export type ignoreSymbol = typeof ignoreSymbol
 
-type MaybeReturn<F> = F extends () => any ? ReturnType<F> : F
+type MaybeReturn<F> = F extends () => infer R ? R : NonNullable<F>
 
-type Values<X extends [any, any]> = X extends any
-  ? { [k in keyof X[0]]-?: k extends X[1] ? never : MaybeReturn<X[0][k]> }[keyof X[0]]
+type Values<X extends [any, any]> = X extends [infer A, infer Ignore]
+  ? Exclude<keyof A, Ignore> extends infer k ? k extends keyof A ? MaybeReturn<A[k]> : never : never
   : never
 
-type Ignore<X> = X extends {
-  [ignoreSymbol]?: any
-} ? keyof NonNullable<X[ignoreSymbol]>
+type Ignore<X> = X extends { [ignoreSymbol]?: infer Obj } ? keyof NonNullable<Obj>
   : never
 
 type ExtractTypes<
-  X extends {
-    [typeSymbol]?: any
-    [unifySymbol]?: any
-  }
-> = X extends any ? [
-    NonNullable<X[unifySymbol]>,
-    Ignore<X>
-  ]
+  X
+> = X extends {
+  [typeSymbol]?: infer _Type
+  [unifySymbol]?: infer _Unify
+} ? [NonNullable<_Unify>, Ignore<X>]
   : never
 
 type FilterIn<A> = A extends any ? typeSymbol extends keyof A ? A : never : never
diff --git a/packages/effect/src/internal/core-effect.ts b/packages/effect/src/internal/core-effect.ts
index 8dfc44b07d..5d3c929fc4 100644
--- a/packages/effect/src/internal/core-effect.ts
+++ b/packages/effect/src/internal/core-effect.ts
@@ -1055,17 +1055,17 @@ const loopDiscard = <S, X, E, R>(
 
 /* @internal */
 export const mapAccum: {
-  <S, A, B, E, R>(
+  <S, A, B, E, R, I extends Iterable<A> = Iterable<A>>(
     zero: S,
     f: (s: S, a: A, i: number) => Effect.Effect<readonly [S, B], E, R>
-  ): (elements: Iterable<A>) => Effect.Effect<[S, Array<B>], E, R>
-  <A, S, B, E, R>(
-    elements: Iterable<A>,
+  ): (elements: I) => Effect.Effect<[S, Arr.ReadonlyArray.With<I, B>], E, R>
+  <A, S, B, E, R, I extends Iterable<A> = Iterable<A>>(
+    elements: I,
     zero: S,
     f: (s: S, a: A, i: number) => Effect.Effect<readonly [S, B], E, R>
-  ): Effect.Effect<[S, Array<B>], E, R>
-} = dual(3, <A, S, B, E, R>(
-  elements: Iterable<A>,
+  ): Effect.Effect<[S, Arr.ReadonlyArray.With<I, B>], E, R>
+} = dual(3, <A, S, B, E, R, I extends Iterable<A> = Iterable<A>>(
+  elements: I,
   zero: S,
   f: (s: S, a: A, i: number) => Effect.Effect<readonly [S, B], E, R>
 ): Effect.Effect<[S, Array<B>], E, R> =>
diff --git a/packages/effect/src/internal/effect/circular.ts b/packages/effect/src/internal/effect/circular.ts
index 53a75fea5c..4b700fd963 100644
--- a/packages/effect/src/internal/effect/circular.ts
+++ b/packages/effect/src/internal/effect/circular.ts
@@ -112,10 +112,16 @@ export const unsafeMakeSemaphore = (permits: number): Semaphore => new Semaphore
 /** @internal */
 export const makeSemaphore = (permits: number) => core.sync(() => unsafeMakeSemaphore(permits))
 
-class Latch implements Effect.Latch {
+class Latch extends Effectable.Class<void> implements Effect.Latch {
   waiters: Array<(_: Effect.Effect<void>) => void> = []
   scheduled = false
-  constructor(private isOpen: boolean) {}
+  constructor(private isOpen: boolean) {
+    super()
+  }
+
+  commit() {
+    return this.await
+  }
 
   private unsafeSchedule(fiber: Fiber.RuntimeFiber<void>) {
     if (this.scheduled || this.waiters.length === 0) {
diff --git a/packages/effect/src/internal/layer.ts b/packages/effect/src/internal/layer.ts
index ca60bd5414..7cf47e70a6 100644
--- a/packages/effect/src/internal/layer.ts
+++ b/packages/effect/src/internal/layer.ts
@@ -10,6 +10,7 @@ import type { LazyArg } from "../Function.js"
 import { dual, pipe } from "../Function.js"
 import * as HashMap from "../HashMap.js"
 import type * as Layer from "../Layer.js"
+import type * as ManagedRuntime from "../ManagedRuntime.js"
 import { pipeArguments } from "../Pipeable.js"
 import { hasProperty } from "../Predicate.js"
 import type * as Runtime from "../Runtime.js"
@@ -23,6 +24,7 @@ import * as effect from "./core-effect.js"
 import * as core from "./core.js"
 import * as circular from "./effect/circular.js"
 import * as fiberRuntime from "./fiberRuntime.js"
+import * as circularManagedRuntime from "./managedRuntime/circular.js"
 import * as EffectOpCodes from "./opCodes/effect.js"
 import * as OpCodes from "./opCodes/layer.js"
 import * as ref from "./ref.js"
@@ -1300,6 +1302,9 @@ export const effect_provide = dual<
     <R2>(
       runtime: Runtime.Runtime<R2>
     ): <A, E, R>(self: Effect.Effect<A, E, R>) => Effect.Effect<A, E, Exclude<R, R2>>
+    <E2, R2>(
+      managedRuntime: ManagedRuntime.ManagedRuntime<R2, E2>
+    ): <A, E, R>(self: Effect.Effect<A, E, R>) => Effect.Effect<A, E | E2, Exclude<R, R2>>
   },
   {
     <A, E, R, ROut, E2, RIn>(
@@ -1314,16 +1319,32 @@ export const effect_provide = dual<
       self: Effect.Effect<A, E, R>,
       runtime: Runtime.Runtime<R2>
     ): Effect.Effect<A, E, Exclude<R, R2>>
+    <A, E, E2, R, R2>(
+      self: Effect.Effect<A, E, R>,
+      managedRuntime: ManagedRuntime.ManagedRuntime<R2, E2>
+    ): Effect.Effect<A, E | E2, Exclude<R, R2>>
   }
 >(
   2,
   <A, E, R, ROut>(
     self: Effect.Effect<A, E, R>,
-    source: Layer.Layer<ROut, any, any> | Context.Context<ROut> | Runtime.Runtime<ROut>
-  ): Effect.Effect<any, any, Exclude<R, ROut>> =>
-    isLayer(source)
-      ? provideSomeLayer(self, source as Layer.Layer<ROut, any, any>)
-      : Context.isContext(source)
-      ? core.provideSomeContext(self, source)
-      : provideSomeRuntime(self, source as Runtime.Runtime<ROut>)
+    source:
+      | Layer.Layer<ROut, any, any>
+      | Context.Context<ROut>
+      | Runtime.Runtime<ROut>
+      | ManagedRuntime.ManagedRuntime<ROut, any>
+  ): Effect.Effect<any, any, Exclude<R, ROut>> => {
+    if (isLayer(source)) {
+      return provideSomeLayer(self, source as Layer.Layer<ROut, any, any>)
+    } else if (Context.isContext(source)) {
+      return core.provideSomeContext(self, source)
+    } else if (circularManagedRuntime.TypeId in source) {
+      return core.flatMap(
+        (source as ManagedRuntime.ManagedRuntime<ROut, any>).runtimeEffect,
+        (rt) => provideSomeRuntime(self, rt)
+      )
+    } else {
+      return provideSomeRuntime(self, source as Runtime.Runtime<ROut>)
+    }
+  }
 )
diff --git a/packages/effect/src/internal/managedRuntime.ts b/packages/effect/src/internal/managedRuntime.ts
index a647fabc57..4a27cf77f9 100644
--- a/packages/effect/src/internal/managedRuntime.ts
+++ b/packages/effect/src/internal/managedRuntime.ts
@@ -1,22 +1,28 @@
 import type * as Effect from "../Effect.js"
+import * as Effectable from "../Effectable.js"
 import type { Exit } from "../Exit.js"
 import type * as Fiber from "../Fiber.js"
 import type * as Layer from "../Layer.js"
-import type { ManagedRuntime } from "../ManagedRuntime.js"
+import type * as M from "../ManagedRuntime.js"
 import { pipeArguments } from "../Pipeable.js"
+import { hasProperty } from "../Predicate.js"
 import type * as Runtime from "../Runtime.js"
 import * as Scope from "../Scope.js"
 import * as effect from "./core-effect.js"
 import * as core from "./core.js"
 import * as fiberRuntime from "./fiberRuntime.js"
 import * as internalLayer from "./layer.js"
+import * as circular from "./managedRuntime/circular.js"
 import * as internalRuntime from "./runtime.js"
 
-interface ManagedRuntimeImpl<R, E> extends ManagedRuntime<R, E> {
+interface ManagedRuntimeImpl<R, E> extends M.ManagedRuntime<R, E> {
   readonly scope: Scope.CloseableScope
   cachedRuntime: Runtime.Runtime<R> | undefined
 }
 
+/** @internal */
+export const isManagedRuntime = (u: unknown): u is M.ManagedRuntime<unknown, unknown> => hasProperty(u, circular.TypeId)
+
 function provide<R, ER, A, E>(
   managed: ManagedRuntimeImpl<R, ER>,
   effect: Effect.Effect<A, E, R>
@@ -32,34 +38,42 @@ function provide<R, ER, A, E>(
   )
 }
 
+const ManagedRuntimeProto = {
+  ...Effectable.CommitPrototype,
+  [circular.TypeId]: circular.TypeId,
+  pipe() {
+    return pipeArguments(this, arguments)
+  },
+  commit(this: ManagedRuntimeImpl<unknown, unknown>) {
+    return this.runtimeEffect
+  }
+}
+
 /** @internal */
 export const make = <R, ER>(
   layer: Layer.Layer<R, ER, never>,
   memoMap?: Layer.MemoMap
-): ManagedRuntime<R, ER> => {
+): M.ManagedRuntime<R, ER> => {
   memoMap = memoMap ?? internalLayer.unsafeMakeMemoMap()
   const scope = internalRuntime.unsafeRunSyncEffect(fiberRuntime.scopeMake())
-  const self: ManagedRuntimeImpl<R, ER> = {
+  const runtimeEffect = internalRuntime.unsafeRunSyncEffect(
+    effect.memoize(
+      core.tap(
+        Scope.extend(
+          internalLayer.toRuntimeWithMemoMap(layer, memoMap),
+          scope
+        ),
+        (rt) => {
+          self.cachedRuntime = rt
+        }
+      )
+    )
+  )
+  const self: ManagedRuntimeImpl<R, ER> = Object.assign(Object.create(ManagedRuntimeProto), {
     memoMap,
     scope,
-    runtimeEffect: internalRuntime
-      .unsafeRunSyncEffect(
-        effect.memoize(
-          core.tap(
-            Scope.extend(
-              internalLayer.toRuntimeWithMemoMap(layer, memoMap),
-              scope
-            ),
-            (rt) => {
-              self.cachedRuntime = rt
-            }
-          )
-        )
-      ),
+    runtimeEffect,
     cachedRuntime: undefined,
-    pipe() {
-      return pipeArguments(this, arguments)
-    },
     runtime() {
       return self.cachedRuntime === undefined ?
         internalRuntime.unsafeRunPromiseEffect(self.runtimeEffect) :
@@ -110,6 +124,6 @@ export const make = <R, ER>(
         internalRuntime.unsafeRunPromiseEffect(provide(self, effect), options) :
         internalRuntime.unsafeRunPromise(self.cachedRuntime)(effect, options)
     }
-  }
+  })
   return self
 }
diff --git a/packages/effect/src/internal/managedRuntime/circular.ts b/packages/effect/src/internal/managedRuntime/circular.ts
new file mode 100644
index 0000000000..9abefc95c1
--- /dev/null
+++ b/packages/effect/src/internal/managedRuntime/circular.ts
@@ -0,0 +1,6 @@
+import type * as M from "../../ManagedRuntime.js"
+
+// circular with Layer
+
+/** @internal */
+export const TypeId: M.TypeId = Symbol.for("effect/ManagedRuntime") as M.TypeId
diff --git a/packages/effect/src/internal/pool.ts b/packages/effect/src/internal/pool.ts
index 8079a98fb6..d32b91beb2 100644
--- a/packages/effect/src/internal/pool.ts
+++ b/packages/effect/src/internal/pool.ts
@@ -2,6 +2,7 @@ import type { Cause } from "effect/Cause"
 import * as Context from "../Context.js"
 import * as Duration from "../Duration.js"
 import type { Effect, Semaphore } from "../Effect.js"
+import * as Effectable from "../Effectable.js"
 import type { Exit } from "../Exit.js"
 import { dual, identity } from "../Function.js"
 import * as Iterable from "../Iterable.js"
@@ -122,7 +123,7 @@ interface Strategy<A, E> {
   readonly reclaim: (pool: PoolImpl<A, E>) => Effect<Option.Option<PoolItem<A, E>>>
 }
 
-class PoolImpl<A, E> implements Pool<A, E> {
+class PoolImpl<A, E> extends Effectable.Class<A, E, Scope> implements Pool<A, E> {
   readonly [PoolTypeId]: Pool.Variance<A, E>[PoolTypeId_]
 
   isShuttingDown = false
@@ -140,6 +141,7 @@ class PoolImpl<A, E> implements Pool<A, E> {
     readonly strategy: Strategy<A, E>,
     readonly targetUtilization: number
   ) {
+    super()
     this[PoolTypeId] = poolVariance
     this.semaphore = circular.unsafeMakeSemaphore(concurrency * maxSize)
   }
@@ -253,6 +255,10 @@ class PoolImpl<A, E> implements Pool<A, E> {
     )
   )
 
+  commit() {
+    return this.get
+  }
+
   readonly get: Effect<A, E, Scope> = core.flatMap(
     core.suspend(() => this.isShuttingDown ? core.interrupt : this.getPoolItem),
     (_) => _.exit
diff --git a/packages/effect/src/internal/resource.ts b/packages/effect/src/internal/resource.ts
index 74a21dc314..bd1bf5e706 100644
--- a/packages/effect/src/internal/resource.ts
+++ b/packages/effect/src/internal/resource.ts
@@ -4,6 +4,7 @@ import type * as Resource from "../Resource.js"
 import type * as Schedule from "../Schedule.js"
 import type * as Scope from "../Scope.js"
 import * as core from "./core.js"
+import * as effectable from "./effectable.js"
 import * as fiberRuntime from "./fiberRuntime.js"
 import * as _schedule from "./schedule.js"
 import * as scopedRef from "./scopedRef.js"
@@ -23,6 +24,15 @@ const resourceVariance = {
   _A: (_: any) => _
 }
 
+/** @internal  */
+const proto: ThisType<Resource.Resource<any, any>> = {
+  ...effectable.CommitPrototype,
+  commit() {
+    return get(this)
+  },
+  [ResourceTypeId]: resourceVariance
+}
+
 /** @internal */
 export const auto = <A, E, R, Out, R2>(
   acquire: Effect.Effect<A, E, R>,
@@ -46,11 +56,12 @@ export const manual = <A, E, R>(
   core.flatMap(core.context<R>(), (env) =>
     pipe(
       scopedRef.fromAcquire(core.exit(acquire)),
-      core.map((ref) => ({
-        [ResourceTypeId]: resourceVariance,
-        scopedRef: ref,
-        acquire: core.provideContext(acquire, env)
-      }))
+      core.map((ref) => {
+        const resource = Object.create(proto)
+        resource.scopedRef = ref
+        resource.acquire = core.provideContext(acquire, env)
+        return resource
+      })
     ))
 
 /** @internal */
diff --git a/packages/effect/src/internal/scopedRef.ts b/packages/effect/src/internal/scopedRef.ts
index 2e588c36b7..dca8d7d481 100644
--- a/packages/effect/src/internal/scopedRef.ts
+++ b/packages/effect/src/internal/scopedRef.ts
@@ -2,11 +2,11 @@ import * as Context from "../Context.js"
 import type * as Effect from "../Effect.js"
 import type { LazyArg } from "../Function.js"
 import { dual, pipe } from "../Function.js"
-import { pipeArguments } from "../Pipeable.js"
 import type * as Scope from "../Scope.js"
 import type * as ScopedRef from "../ScopedRef.js"
 import * as core from "./core.js"
 import * as circular from "./effect/circular.js"
+import * as effectable from "./effectable.js"
 import * as fiberRuntime from "./fiberRuntime.js"
 import * as ref from "./ref.js"
 import * as synchronized from "./synchronizedRef.js"
@@ -25,6 +25,15 @@ const scopedRefVariance = {
   _A: (_: any) => _
 }
 
+/** @internal  */
+const proto: ThisType<ScopedRef.ScopedRef<any>> = {
+  ...effectable.CommitPrototype,
+  commit() {
+    return get(this)
+  },
+  [ScopedRefTypeId]: scopedRefVariance
+}
+
 /** @internal  */
 const close = <A>(self: ScopedRef.ScopedRef<A>): Effect.Effect<void> =>
   core.flatMap(ref.get(self.ref), (tuple) => tuple[0].close(core.exitVoid))
@@ -41,13 +50,8 @@ export const fromAcquire = <A, E, R>(
         core.flatMap((value) =>
           circular.makeSynchronized([newScope, value] as const).pipe(
             core.flatMap((ref) => {
-              const scopedRef: ScopedRef.ScopedRef<A> = {
-                [ScopedRefTypeId]: scopedRefVariance,
-                pipe() {
-                  return pipeArguments(this, arguments)
-                },
-                ref
-              }
+              const scopedRef = Object.create(proto)
+              scopedRef.ref = ref
               return pipe(
                 fiberRuntime.addFinalizer(() => close(scopedRef)),
                 core.as(scopedRef)
diff --git a/packages/effect/test/Effect/latch.test.ts b/packages/effect/test/Effect/latch.test.ts
index e85d56184e..019cd8c8d9 100644
--- a/packages/effect/test/Effect/latch.test.ts
+++ b/packages/effect/test/Effect/latch.test.ts
@@ -30,4 +30,14 @@ describe("Latch", () => {
       yield* latch.release
       assert.deepStrictEqual(yield* fiber.await, Exit.void)
     }))
+
+  it.effect("subtype of Effect", () =>
+    Effect.gen(function*() {
+      const latch = yield* Effect.makeLatch()
+      const fiber = yield* Effect.fork(latch)
+
+      yield* latch.open
+
+      assert.deepStrictEqual(yield* fiber.await, Exit.void)
+    }))
 })
diff --git a/packages/effect/test/ManagedRuntime.test.ts b/packages/effect/test/ManagedRuntime.test.ts
index 4877112a1b..defe8e4445 100644
--- a/packages/effect/test/ManagedRuntime.test.ts
+++ b/packages/effect/test/ManagedRuntime.test.ts
@@ -3,6 +3,7 @@ import * as Context from "effect/Context"
 import * as Effect from "effect/Effect"
 import * as FiberRef from "effect/FiberRef"
 import * as Layer from "effect/Layer"
+import * as it from "effect/test/utils/extend"
 import { assert, describe, test } from "vitest"
 
 describe.concurrent("ManagedRuntime", () => {
@@ -48,4 +49,17 @@ describe.concurrent("ManagedRuntime", () => {
     await runtimeB.dispose()
     assert.strictEqual(count, 1)
   })
+
+  it.effect(
+    "is subtype of effect",
+    () =>
+      Effect.gen(function*() {
+        const tag = Context.GenericTag<string>("string")
+        const layer = Layer.succeed(tag, "test")
+        const managedRuntime = ManagedRuntime.make(layer)
+        const runtime = yield* managedRuntime
+        const result = Context.get(runtime.context, tag)
+        assert.strictEqual(result, "test")
+      })
+  )
 })
diff --git a/packages/effect/test/Pool.test.ts b/packages/effect/test/Pool.test.ts
index 756a838b34..c0de074820 100644
--- a/packages/effect/test/Pool.test.ts
+++ b/packages/effect/test/Pool.test.ts
@@ -423,4 +423,14 @@ describe("Pool", () => {
       expect(yield* Ref.get(allocations)).toBe(11)
       expect(yield* Ref.get(released)).toBe(11)
     }))
+
+  it.scoped("is subtype of Effect", () =>
+    Effect.gen(function*() {
+      const pool = yield* Pool.make({
+        acquire: Effect.succeed(1),
+        size: 1
+      })
+      const item = yield* pool
+      assert.strictEqual(item, 1)
+    }))
 })
diff --git a/packages/effect/test/Predicate.test.ts b/packages/effect/test/Predicate.test.ts
index 8f0316b2b7..b90676244a 100644
--- a/packages/effect/test/Predicate.test.ts
+++ b/packages/effect/test/Predicate.test.ts
@@ -334,4 +334,10 @@ describe("Predicate", () => {
     assert.deepStrictEqual(_.isTupleOfAtLeast([1, 2, 3], 2), true)
     assert.deepStrictEqual(_.isTupleOfAtLeast([1, 2, 3], 4), false)
   })
+
+  it("isRegExp", () => {
+    assert.deepStrictEqual(_.isRegExp(/a/), true)
+    assert.deepStrictEqual(_.isRegExp(null), false)
+    assert.deepStrictEqual(_.isRegExp("a"), false)
+  })
 })
diff --git a/packages/effect/test/RegExp.test.ts b/packages/effect/test/RegExp.test.ts
index 38844c1953..b39ceab0d0 100644
--- a/packages/effect/test/RegExp.test.ts
+++ b/packages/effect/test/RegExp.test.ts
@@ -2,6 +2,12 @@ import * as RegExp from "effect/RegExp"
 import { describe, expect, it } from "vitest"
 
 describe("RegExp", () => {
+  it("isRegExp", () => {
+    expect(RegExp.isRegExp(/a/)).toEqual(true)
+    expect(RegExp.isRegExp(null)).toEqual(false)
+    expect(RegExp.isRegExp("a")).toEqual(false)
+  })
+
   describe("escape", () => {
     it("should escape special characters correctly", () => {
       const testCases: Array<[string, string]> = [
diff --git a/packages/effect/test/Resource.test.ts b/packages/effect/test/Resource.test.ts
index 5043b9530c..a2b7af50f5 100644
--- a/packages/effect/test/Resource.test.ts
+++ b/packages/effect/test/Resource.test.ts
@@ -51,4 +51,12 @@ describe("Resource", () => {
       assert.strictEqual(result1, 0)
       assert.strictEqual(result2, 0)
     }))
+  it.scoped("subtype of Effect", () =>
+    Effect.gen(function*() {
+      const ref = yield* Ref.make(0)
+      const cached = yield* Cached.manual(ref)
+      const resul1 = yield* cached
+
+      assert.strictEqual(resul1, 0)
+    }))
 })
diff --git a/packages/effect/test/ScopedRef.test.ts b/packages/effect/test/ScopedRef.test.ts
index fcd55f6100..f4c942c922 100644
--- a/packages/effect/test/ScopedRef.test.ts
+++ b/packages/effect/test/ScopedRef.test.ts
@@ -79,4 +79,10 @@ describe("ScopedRef", () => {
       const ref = yield* _(Effect.scoped(ScopedRef.make(() => 0)))
       expect(ref.pipe(identity)).toBe(ref)
     }))
+  it.scoped("subtype of Effect", () =>
+    Effect.gen(function*() {
+      const ref = yield* ScopedRef.make(() => 0)
+      const result = yield* ref
+      assert.strictEqual(result, 0)
+    }))
 })