Fixed an issue where optional comparisons would not be ordered correctly

Sources/CodableDatastore/Indexes/Indexable.swift

@@ -80,7 +80,7 @@ extension UInt64: DiscreteIndexable, RangedIndexable {}
 extension Optional: Comparable where Wrapped: Comparable {
     public static func < (lhs: Self, rhs: Self) -> Bool {
         if let lhs, let rhs { return lhs < rhs }
-        return lhs == nil
+        return lhs == nil && rhs != nil
     }
 }
 extension Optional: DiscreteIndexable where Wrapped: DiscreteIndexable {}

Tests/CodableDatastoreTests/OptionalTests.swift

@@ -0,0 +1,19 @@
+//
+//  OptionalTests.swift
+//  CodableDatastore
+//
+//  Created by Dimitri Bouniol on 2024-04-20.
+//  Copyright © 2023-24 Mochi Development, Inc. All rights reserved.
+//
+
+import XCTest
+@testable import CodableDatastore
+
+final class OptionalTests: XCTestCase {
+    func testComparable() throws {
+        XCTAssertTrue(Int?.some(5) < Int?.some(10))
+        XCTAssertTrue(Int?.none < Int?.some(10))
+        XCTAssertFalse(Int?.some(5) < Int?.none)
+        XCTAssertFalse(Int?.none < Int?.none)
+    }
+}