VecU16.fromPointer constructor
Implementation
VecU16.fromPointer(super.ptr, {bool attach = true, int? length}) : super.fromPointer() {
  if (attach) {
    finalizer.attach(
      this,
      ptr.cast<ffi.Void>(),
      detach: this,
      externalSize: length == null ? null : length * ffi.sizeOf<ffi.Uint16>(),
    );
  }
}