Function flipEncoding

repos/effect/packages/effect/src/SchemaAST.ts:3437–3453

(ast: AST, encoding: Encoding)

export function mapOrSame<A>(as: ReadonlyArray<A>, f: (a: A) => A): ReadonlyArray<A>
export function mapOrSame<A>(as: ReadonlyArray<A>, f: (a: A) => A): ReadonlyArray<A> {
  let changed = false
  const out: Array<A> = new Array(as.length)
  for (let i = 0; i < as.length; i++) {
    const a = as[i]
    const fa = f(a)
    if (fa !== a) {
      changed = true
    }
    out[i] = fa
  }
  return changed ? out : as
}

/** @internal */
export function annotateKey<A extends AST>(ast: A, annotations: Schema.Annotations.Key<unknown>): A {
  const context = ast.context ?
    new Context(
      ast.context.isOptional,
      ast.context.isMutable,
      ast.context.constructorDefault,