Added a raw UUID comparison thats always available

Author: dimitribouniol

Sources/CodableDatastore/Indexes/UUID+Comparable.swift

@@ -15,44 +15,42 @@ extension UUID: @retroactive Comparable {
     @inlinable
     @_disfavoredOverload
     public static func < (lhs: UUID, rhs: UUID) -> Bool {
-        lhs.isLessThan(rhs: rhs)
+        lhs.uuid < rhs.uuid
     }
 }
 #else
 extension UUID: Comparable {
     @inlinable
     @_disfavoredOverload
     public static func < (lhs: UUID, rhs: UUID) -> Bool {
-        lhs.isLessThan(rhs: rhs)
+        lhs.uuid < rhs.uuid
     }
 }
 #endif
 #endif
 
-extension UUID {
-    /// Make UUIDs comparable, so that they can be used transparently as an index.
-    ///
-    /// - SeeAlso: https://github.com/apple/swift-foundation/blob/5388acf1d929865d4df97d3c50e4d08bc4c6bdf0/Sources/FoundationEssentials/UUID.swift#L135-L156
-    @usableFromInline
-    func isLessThan(rhs: UUID) -> Bool {
-        var leftUUID = self.uuid
-        var rightUUID = rhs.uuid
-        var result: Int = 0
-        var diff: Int = 0
-        withUnsafeBytes(of: &leftUUID) { leftPtr in
-            withUnsafeBytes(of: &rightUUID) { rightPtr in
-                for offset in (0 ..< MemoryLayout<uuid_t>.size).reversed() {
-                    diff = Int(leftPtr.load(fromByteOffset: offset, as: UInt8.self)) -
-                    Int(rightPtr.load(fromByteOffset: offset, as: UInt8.self))
-                    // Constant time, no branching equivalent of
-                    // if (diff != 0) {
-                    //     result = diff;
-                    // }
-                    result = (result & (((diff - 1) & ~diff) >> 8)) | diff
-                }
+/// Make UUIDs comparable, so that they can be used transparently as an index.
+///
+/// - SeeAlso: https://github.com/apple/swift-foundation/blob/5388acf1d929865d4df97d3c50e4d08bc4c6bdf0/Sources/FoundationEssentials/UUID.swift#L135-L156
+@inlinable
+public func < (lhs: uuid_t, rhs: uuid_t) -> Bool {
+    var lhs = lhs
+    var rhs = rhs
+    var result: Int = 0
+    var diff: Int = 0
+    withUnsafeBytes(of: &lhs) { leftPtr in
+        withUnsafeBytes(of: &rhs) { rightPtr in
+            for offset in (0 ..< MemoryLayout<uuid_t>.size).reversed() {
+                diff = Int(leftPtr.load(fromByteOffset: offset, as: UInt8.self)) -
+                Int(rightPtr.load(fromByteOffset: offset, as: UInt8.self))
+                // Constant time, no branching equivalent of
+                // if (diff != 0) {
+                //     result = diff;
+                // }
+                result = (result & (((diff - 1) & ~diff) >> 8)) | diff
             }
         }
-        
-        return result < 0
     }
+    
+    return result < 0
 }