diff --git a/packages/effect-lens/src/Lens.ts b/packages/effect-lens/src/Lens.ts
index 77b7b54..52035ee 100644
--- a/packages/effect-lens/src/Lens.ts
+++ b/packages/effect-lens/src/Lens.ts
@@ -27,6 +27,10 @@ extends Subscribable.Subscribable<A, ER, RR> {
  */
 export const isLens = (u: unknown): u is Lens<unknown, unknown, unknown, unknown, unknown> => Predicate.hasProperty(u, LensTypeId)
 
+
+
+
+
 export const LensWithInternalsTypeId: unique symbol = Symbol.for("@effect-fc/Lens/LensWithInternals")
 export type LensWithInternalsTypeId = typeof LensWithInternalsTypeId
 
@@ -49,41 +53,56 @@ export const asLensWithInternals = <A, ER, EW, RR, RW>(
 }
 
 
-export declare namespace LensImpl {
-    export interface Source<in out A, in out ER = never, in out EW = never, in out RR = never, in out RW = never> {
-        readonly get: Effect.Effect<A, ER, RR>,
-        readonly changes: Stream.Stream<A, ER, RR>,
-        readonly update: (a: A) => Effect.Effect<void, EW, RW>,
-        readonly withLock: <A1, E1, R1>(self: Effect.Effect<A1, E1, R1>) => Effect.Effect<A1, EW | E1, RW | R1>,
-    }
-}
-
-export class LensImpl<in out A, in out ER = never, in out EW = never, in out RR = never, in out RW = never>
-extends Pipeable.Class() implements LensWithInternals<A, ER, EW, RR, RW> {
+export abstract class LensImpl<in out A, in out ER = never, in out EW = never, in out RR = never, in out RW = never>
+extends Pipeable.Class() {
     readonly [Readable.TypeId]: Readable.TypeId = Readable.TypeId
     readonly [Subscribable.TypeId]: Subscribable.TypeId = Subscribable.TypeId
     readonly [LensTypeId]: LensTypeId = LensTypeId
     readonly [LensWithInternalsTypeId]: LensWithInternalsTypeId = LensWithInternalsTypeId
 
-    readonly get: Effect.Effect<A, ER, RR>
-    readonly changes: Stream.Stream<A, ER, RR>
-    readonly update: (a: A) => Effect.Effect<void, EW, RW>
-    readonly withLock: <A1, E1, R1>(self: Effect.Effect<A1, E1, R1>) => Effect.Effect<A1, EW | E1, RW | R1>
-
-    constructor(
-        source: LensImpl.Source<A, ER, EW, RR, RW>
-    ) {
-        super()
-
-        this.get = source.get
-        this.changes = source.changes
-        this.update = source.update
-        this.withLock = source.withLock
-    }
+    abstract readonly get: Effect.Effect<A, ER, RR>
+    abstract readonly changes: Stream.Stream<A, ER, RR>
+    abstract readonly update: (a: A) => Effect.Effect<void, EW, RW>
+    abstract readonly withLock: <A1, E1, R1>(self: Effect.Effect<A1, E1, R1>) => Effect.Effect<A1, EW | E1, RW | R1>
 
     modifyEffect = modifyEffect
 }
 
+// export declare namespace LensImpl {
+//     export interface Source<in out A, in out ER = never, in out EW = never, in out RR = never, in out RW = never> {
+//         readonly get: Effect.Effect<A, ER, RR>,
+//         readonly changes: Stream.Stream<A, ER, RR>,
+//         readonly update: (a: A) => Effect.Effect<void, EW, RW>,
+//         readonly withLock: <A1, E1, R1>(self: Effect.Effect<A1, E1, R1>) => Effect.Effect<A1, EW | E1, RW | R1>,
+//     }
+// }
+
+// export class LensImpl<in out A, in out ER = never, in out EW = never, in out RR = never, in out RW = never>
+// extends Pipeable.Class() implements LensWithInternals<A, ER, EW, RR, RW> {
+//     readonly [Readable.TypeId]: Readable.TypeId = Readable.TypeId
+//     readonly [Subscribable.TypeId]: Subscribable.TypeId = Subscribable.TypeId
+//     readonly [LensTypeId]: LensTypeId = LensTypeId
+//     readonly [LensWithInternalsTypeId]: LensWithInternalsTypeId = LensWithInternalsTypeId
+
+//     readonly get: Effect.Effect<A, ER, RR>
+//     readonly changes: Stream.Stream<A, ER, RR>
+//     readonly update: (a: A) => Effect.Effect<void, EW, RW>
+//     readonly withLock: <A1, E1, R1>(self: Effect.Effect<A1, E1, R1>) => Effect.Effect<A1, EW | E1, RW | R1>
+
+//     constructor(
+//         source: LensImpl.Source<A, ER, EW, RR, RW>
+//     ) {
+//         super()
+
+//         this.get = source.get
+//         this.changes = source.changes
+//         this.update = source.update
+//         this.withLock = source.withLock
+//     }
+
+//     modifyEffect = modifyEffect
+// }
+
 function modifyEffect<A, B, ER = never, EW = never, E1 = never, RR = never, RW = never, R1 = never>(
     this: LensWithInternals<A, ER, EW, RR, RW>,
     f: (a: A) => Effect.Effect<readonly [B, A], E1, R1>,