[NFC] replace type-erased pattern matching with typed if-else blocks (#3840)

This removes an unreachable `default` case, should result in less runtime cost.

Author: WowbaggersLiquidLunch

Sources/PackageDescription/Version.swift

@@ -99,22 +99,24 @@ extension Version: Comparable {
             return true // Prerelease lhs < non-prerelease rhs 
         }
 
-        let zippedIdentifiers = zip(lhs.prereleaseIdentifiers, rhs.prereleaseIdentifiers)
-        for (lhsPrereleaseIdentifier, rhsPrereleaseIdentifier) in zippedIdentifiers {
+        for (lhsPrereleaseIdentifier, rhsPrereleaseIdentifier) in zip(lhs.prereleaseIdentifiers, rhs.prereleaseIdentifiers) {
             if lhsPrereleaseIdentifier == rhsPrereleaseIdentifier {
                 continue
             }
 
-            let typedLhsIdentifier: Any = Int(lhsPrereleaseIdentifier) ?? lhsPrereleaseIdentifier
-            let typedRhsIdentifier: Any = Int(rhsPrereleaseIdentifier) ?? rhsPrereleaseIdentifier
+            // Check if either of the 2 pre-release identifiers is numeric.
+            let lhsNumericPrereleaseIdentifier = Int(lhsPrereleaseIdentifier)
+            let rhsNumericPrereleaseIdentifier = Int(rhsPrereleaseIdentifier)
 
-            switch (typedLhsIdentifier, typedRhsIdentifier) {
-            case let (int1 as Int, int2 as Int): return int1 < int2
-            case let (string1 as String, string2 as String): return string1 < string2
-            case (is Int, is String): return true // Int prereleases < String prereleases
-            case (is String, is Int): return false
-            default:
-                return false
+            if let lhsNumericPrereleaseIdentifier = lhsNumericPrereleaseIdentifier,
+               let rhsNumericPrereleaseIdentifier = rhsNumericPrereleaseIdentifier {
+                return lhsNumericPrereleaseIdentifier < rhsNumericPrereleaseIdentifier
+            } else if lhsNumericPrereleaseIdentifier != nil {
+                return true // numeric pre-release < non-numeric pre-release
+            } else if rhsNumericPrereleaseIdentifier != nil {
+                return false // non-numeric pre-release > numeric pre-release
+            } else {
+                return lhsPrereleaseIdentifier < rhsPrereleaseIdentifier
             }
         }