phase: 20.49 COMPLETE; 20.50 Flow+String minimal reps; 20.51 selfhost v0/v1 minimal (Option A/B); hv1-inline binop/unop/copy; docs + run_all + CURRENT_TASK -> 21.0

local_tests/test_array_improvements.hako

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+// test_array_improvements.hako - ArrayBox Phase 2 improvements test
+// Testing: sort(), reverse(), indexOf(), slice() methods
+
+print("📦 Testing ArrayBox improvements...")
+
+// Basic array creation and setup
+local arr, result, sliceResult
+
+print("=== Setup: Creating test array ===")
+arr = new ArrayBox()
+arr.push(3)
+arr.push(1)
+arr.push(4)
+arr.push(1)
+arr.push(5)
+print("Original array: " + arr.toString())
+
+print("\n=== Test 1: sort() method ===")
+arr.sort()
+print("After sort(): " + arr.toString())
+// Expected: [1, 1, 3, 4, 5]
+
+print("\n=== Test 2: reverse() method ===")
+arr.reverse()
+print("After reverse(): " + arr.toString())
+// Expected: [5, 4, 3, 1, 1]
+
+print("\n=== Test 3: indexOf() method ===")
+result = arr.indexOf(4)
+print("indexOf(4): " + result.toString())
+// Expected: 1
+
+result = arr.indexOf(1)
+print("indexOf(1): " + result.toString())  
+// Expected: 3 (first occurrence from current order)
+
+result = arr.indexOf(999)
+print("indexOf(999): " + result.toString())
+// Expected: -1 (not found)
+
+print("\n=== Test 4: slice() method ===")
+sliceResult = arr.slice(1, 4)
+print("slice(1, 4): " + sliceResult.toString())
+// Expected: [4, 3, 1] (indices 1, 2, 3)
+
+sliceResult = arr.slice(0, 2)
+print("slice(0, 2): " + sliceResult.toString())
+// Expected: [5, 4] (indices 0, 1)
+
+sliceResult = arr.slice(2, 10)  // End beyond array
+print("slice(2, 10): " + sliceResult.toString())
+// Expected: [3, 1, 1] (indices 2 to end)
+
+print("\n=== Test 5: Mixed types sorting ===")
+local mixedArr
+mixedArr = new ArrayBox()
+mixedArr.push("banana")
+mixedArr.push(2)
+mixedArr.push("apple")
+mixedArr.push(1)
+mixedArr.push("cherry")
+print("Mixed array before sort: " + mixedArr.toString())
+
+mixedArr.sort()
+print("Mixed array after sort: " + mixedArr.toString())
+// Expected: numbers first (1, 2), then strings alphabetically
+
+print("\n=== Test 6: FloatBox integration ===")
+local floatArr
+floatArr = new ArrayBox()
+floatArr.push(new FloatBox(3.14))
+floatArr.push(1)
+floatArr.push(new FloatBox(2.71))
+floatArr.push(4)
+print("Float array before sort: " + floatArr.toString())
+
+floatArr.sort()
+print("Float array after sort: " + floatArr.toString())
+// Expected: [1, 2.71, 3.14, 4]
+
+print("\n✅ ArrayBox Phase 2 improvements tests completed!")