Merge branch 'master' into 5.x

Author: nvzqz

README.md

@@ -248,6 +248,12 @@ Xoroshiro.withThreadLocal { randomGenerator in
 }
 ```
 
+As a shortcut, you can even apply a function directly as a parameter.
+
+```swift
+let value = Xoroshiro.withThreadLocal(Int.random)
+```
+
 Prior to [v4.4.0](https://github.com/nvzqz/RandomKit/releases/tag/v4.4.0),
 thread safety could be achieved by instantiating a new seeded instance of a
 given `RandomGenerator` type. The problem with this is that unnecessary seeding

Sources/RandomKit/Types/RandomGenerator/ReseedingRandomGenerator.swift

@@ -31,7 +31,7 @@ public struct ReseedingRandomGenerator<Base: RandomGenerator & SeedableFromRando
     fileprivate var _bytesGenerated: Int = 0
 
     /// The byte threshold indicating the maximum number of bytes that can be generated before `self` is reseeded.
-    public let threshold: Int
+    public var threshold: Int
 
     /// The base `RandomGenerator` from which to generate values.
     public var base: Base

Sources/RandomKit/Types/RandomGenerator/ThreadLocal.swift

@@ -73,6 +73,7 @@ private func _key(for type: Any.Type) -> pthread_key_t {
     } else {
         var key = pthread_key_t()
         pthread_key_create(&key) {
+            // Cast required because argument is optional on some platforms (Linux) but not on others (macOS).
             guard let rawPointer = ($0 as UnsafeMutableRawPointer?) else {
                 return
             }