use aiken/builtin pub fn slice(bytes: ByteArray, start: Int, end: Int) -> ByteArray { builtin.slice_bytearray(start, end, bytes) } pub fn take(bytes: ByteArray, n: Int) -> ByteArray { slice(bytes, 0, n) } test take_1() { take(#[1, 2, 3], 2) == #[1, 2] }