Strong mode: _MultiplexRawReceivePort.handler
RawReceivePort declares the handler setter as taking a Function.
diff --git a/lib/src/raw_receive_port_multiplexer.dart b/lib/src/raw_receive_port_multiplexer.dart
index d5cd25e..0e45f4b 100644
--- a/lib/src/raw_receive_port_multiplexer.dart
+++ b/lib/src/raw_receive_port_multiplexer.dart
@@ -35,7 +35,7 @@
_MultiplexRawReceivePort(this._multiplexer, this._id, this._handler);
- void set handler(void handler(response)) {
+ void set handler(Function handler) {
this._handler = handler;
}