remove equatable conformance

Author: arnauddorgans

Sources/Sharing/Internal/Reference.swift

@@ -613,7 +613,7 @@ where Base: MutableReference, Mapper: _MapReferenceWritableMapper<Base.Value, Va
   }
 }
 
-protocol _MapReferenceMapper<Base, Value>: Sendable, Equatable {
+protocol _MapReferenceMapper<Base, Value>: Sendable {
   associatedtype Base
   associatedtype Value
 
@@ -622,7 +622,7 @@ protocol _MapReferenceMapper<Base, Value>: Sendable, Equatable {
   func description(baseDescription: String) -> String
 }
 
-protocol _MapReferenceWritableMapper<Base, Value>: _MapReferenceMapper {
+protocol _MapReferenceWritableMapper<Base, Value>: _MapReferenceMapper, Equatable {
   func mutate<R>(_ base: inout Base, body: (inout Value) throws -> R) rethrows -> R
 }
 
@@ -668,10 +668,6 @@ final class _MapReferenceBlockMapper<Base, Value>: _MapReferenceMapper {
   func description(baseDescription: String) -> String {
     ".map(\(baseDescription), as: \(Value.self).self)"
   }
-  
-  static func == (lhs: _MapReferenceBlockMapper, rhs: _MapReferenceBlockMapper) -> Bool {
-    lhs === rhs
-  }
 }
 
 final class _OptionalReference<Base: Reference<Value?>, Value>:

Tests/SharingTests/EquatableTests.swift

@@ -32,4 +32,18 @@ struct EquatableTests {
     #expect(lhs == rhs)
     #expect($lhs == $rhs)
   }
+  
+  @Test func map() {
+    @Shared(value: 0) var base: Int
+    @SharedReader var lhs: Int
+    @SharedReader var rhs: Int
+    _lhs = $base.map { $0 * 2 }
+    _rhs = $base.map { $0 * 3 }
+    #expect(lhs == rhs)
+    #expect($lhs == $rhs)
+    
+    $base.withLock { $0 += 1 }
+    #expect(lhs != rhs)
+    #expect($lhs != $rhs)
+  }
 }