{"id":"array-transform-no-mutation","text":"The input list is copied on entry (`arr[:]`), so the caller's original list is never modified — contrasting with array-partition and assign-cookies which mutate in-place.","truth_value":"IN","source":"entries/2026/06/06/array-transformation-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"array-transform-no-mutation","truth_value":"IN","reason":"premise"}]}}