diff --git a/Sources/SpellbookFoundation/DictionaryParsing/DictionaryCodingKey.swift b/Sources/SpellbookFoundation/DictionaryParsing/DictionaryCodingKey.swift
index 8c24061..b764a0f 100644
--- a/Sources/SpellbookFoundation/DictionaryParsing/DictionaryCodingKey.swift
+++ b/Sources/SpellbookFoundation/DictionaryParsing/DictionaryCodingKey.swift
@@ -27,36 +27,9 @@ public enum DictionaryCodingKey {
     case index(Int)
 }
 
-extension DictionaryCodingKey: CodingKey {
-    public init(stringValue: String) {
-        self = .key(stringValue)
-    }
-    
-    public var stringValue: String {
-        switch self {
-        case .key(let key):
-            return "\(key)"
-        case .index(let index):
-            return "\(index)"
-        }
-    }
-    
-    public init(intValue: Int) {
-        self = .index(intValue)
-    }
-    
-    public var intValue: Int? {
-        if case .index(let index) = self {
-            return index
-        } else {
-            return nil
-        }
-    }
-}
-
 extension DictionaryCodingKey: ExpressibleByStringLiteral {
     public init(stringLiteral value: StringLiteralType) {
-        self.init(stringValue: value)
+        self = .key(String(value))
     }
 }
 
diff --git a/Sources/SpellbookFoundation/Low Level/AuditToken.swift b/Sources/SpellbookFoundation/Low Level/AuditToken.swift
index 1e1d957..1d1e6a8 100644
--- a/Sources/SpellbookFoundation/Low Level/AuditToken.swift	
+++ b/Sources/SpellbookFoundation/Low Level/AuditToken.swift	
@@ -62,7 +62,7 @@ extension audit_token_t {
     public var pidversion: Int32 { audit_token_to_pidversion(self) }
 }
 
-extension audit_token_t: SafePOD, UnsafePOD {}
+extension audit_token_t: SpellbookFoundation.SafePOD, SpellbookFoundation.UnsafePOD {}
 
 extension NSXPCConnection {
     public var auditToken: audit_token_t {
diff --git a/Sources/SpellbookFoundation/Low Level/POD+Swift.swift b/Sources/SpellbookFoundation/Low Level/POD+Swift.swift
index fe23fee..3940bdb 100644
--- a/Sources/SpellbookFoundation/Low Level/POD+Swift.swift	
+++ b/Sources/SpellbookFoundation/Low Level/POD+Swift.swift	
@@ -79,19 +79,19 @@ public protocol UnsafePOD: PODUnsafeHashable {}
 
 // MARK: - Oftenly used POD types
 
-extension timespec: SafePOD, UnsafePOD {}
-extension fsid_t: SafePOD, UnsafePOD {}
-extension attrlist: SafePOD, UnsafePOD {}
-extension attribute_set: SafePOD, UnsafePOD {}
-extension attrreference: SafePOD, UnsafePOD {}
-extension diskextent: SafePOD, UnsafePOD {}
+extension timespec: SpellbookFoundation.SafePOD, SpellbookFoundation.UnsafePOD {}
+extension fsid_t: SpellbookFoundation.SafePOD, SpellbookFoundation.UnsafePOD {}
+extension attrlist: SpellbookFoundation.SafePOD, SpellbookFoundation.UnsafePOD {}
+extension attribute_set: SpellbookFoundation.SafePOD, SpellbookFoundation.UnsafePOD {}
+extension attrreference: SpellbookFoundation.SafePOD, SpellbookFoundation.UnsafePOD {}
+extension diskextent: SpellbookFoundation.SafePOD, SpellbookFoundation.UnsafePOD {}
 
-extension stat: SafePOD {}
-extension statfs: SafePOD {}
+extension stat: SpellbookFoundation.SafePOD {}
+extension statfs: SpellbookFoundation.SafePOD {}
 
-extension timeval: SafePOD {}
+extension timeval: SpellbookFoundation.SafePOD {}
 
-extension stat: Hashable {
+extension stat: @retroactive Hashable {
     public static func == (lhs: Self, rhs: Self) -> Bool {
         lhs.st_dev == rhs.st_dev &&
             lhs.st_mode == rhs.st_mode &&
@@ -135,7 +135,7 @@ extension stat: Hashable {
     }
 }
 
-extension statfs: Hashable {
+extension statfs: @retroactive Hashable {
     public static func == (lhs: Self, rhs: Self) -> Bool {
         lhs.f_bsize == rhs.f_bsize &&
             lhs.f_iosize == rhs.f_iosize &&
@@ -175,7 +175,7 @@ extension statfs: Hashable {
     }
 }
 
-extension timeval: Hashable {
+extension timeval: @retroactive Hashable {
     public static func == (lhs: Self, rhs: Self) -> Bool {
         lhs.tv_sec == rhs.tv_sec &&
             lhs.tv_usec == rhs.tv_usec
diff --git a/Sources/SpellbookFoundation/Threading & Concurrency/ConcurrentBlockOperation.swift b/Sources/SpellbookFoundation/Threading & Concurrency/ConcurrentBlockOperation.swift
index 7fa0179..8e86111 100644
--- a/Sources/SpellbookFoundation/Threading & Concurrency/ConcurrentBlockOperation.swift	
+++ b/Sources/SpellbookFoundation/Threading & Concurrency/ConcurrentBlockOperation.swift	
@@ -22,7 +22,7 @@
 
 import Foundation
 
-public final class ConcurrentBlockOperation: Operation {
+public final class ConcurrentBlockOperation: Operation, @unchecked Sendable {
     @Atomic private var state: Bool?
     private let block: (ValueView<Bool>, @escaping () -> Void) -> Void
     
diff --git a/Sources/SpellbookFoundation/ValueObserving/EventAsk.swift b/Sources/SpellbookFoundation/ValueObserving/EventAsk.swift
index 600309e..6a39134 100644
--- a/Sources/SpellbookFoundation/ValueObserving/EventAsk.swift
+++ b/Sources/SpellbookFoundation/ValueObserving/EventAsk.swift
@@ -58,8 +58,8 @@ public class EventAskEx<Input, Transformed, Output> {
     }
     
     public func ask(_ value: Input, timeout: Timeout? = nil) async -> Output {
-        await withCheckedContinuation {
-            askAsync(value, timeout: timeout, completion: $0.resume(returning:))
+        await withCheckedContinuation { continuation in
+            askAsync(value, timeout: timeout) { continuation.resume(returning: $0) }
         }
     }
     
diff --git a/Tests/SpellbookTests/Threading & Concurrency/PosixLocksTests.swift b/Tests/SpellbookTests/Threading & Concurrency/PosixLocksTests.swift
deleted file mode 100644
index 098be8e..0000000
--- a/Tests/SpellbookTests/Threading & Concurrency/PosixLocksTests.swift	
+++ /dev/null
@@ -1,26 +0,0 @@
-import SpellbookFoundation
-import SpellbookTestUtils
-
-import Foundation
-import XCTest
-
-class ExtensionsLocksTests: XCTestCase {
-    func test_os_unfair_lock() throws {
-        let lock = UnfairLock()
-        let count = 1000
-        let expFinished = expectation(description: "finished")
-        expFinished.expectedFulfillmentCount = count
-        var sum = 0
-        for i in 0..<count {
-            DispatchQueue.global().async {
-                lock.withLock {
-                    sum += i
-                }
-                expFinished.fulfill()
-            }
-        }
-        
-        waitForExpectations()
-        XCTAssertEqual(sum, (0..<count).reduce(0, +))
-    }
-}
diff --git a/Tests/SpellbookTests/Threading & Concurrency/SynchronousExecutorTests.swift b/Tests/SpellbookTests/Threading & Concurrency/SynchronousExecutorTests.swift
index 1f7b66f..f169318 100644
--- a/Tests/SpellbookTests/Threading & Concurrency/SynchronousExecutorTests.swift	
+++ b/Tests/SpellbookTests/Threading & Concurrency/SynchronousExecutorTests.swift	
@@ -81,7 +81,7 @@ private struct Dummy<T> {
 extension Dummy {
     func asyncValue() async -> T {
         await withCheckedContinuation { continuation in
-            value(reply: continuation.resume(returning:))
+            value { continuation.resume(returning: $0) }
         }
     }