in lib/src/copy/web_socket_impl.dart [460:471]
void addFrame(int opcode, List<int>? data) {
createFrame(
opcode,
data,
webSocket._serverSide,
// Logic around _deflateHelper was removed here, since there will
// never be a deflate helper for a cross-platform WebSocket client.
false)
.forEach((e) {
_eventSink!.add(e);
});
}