nil evaluation error

I founded that after decoding of 0xc0 byte (nil) from msgpack stream msgpack5 decides that stream is finished and then produces error.

I tried to replace text below from function tryDecode of decoder.js
case 0xc0:
return buildDecodeResult(null, 1)
with
case 0xc0:
return buildDecodeResult(undefined, 1)

This correction fixed error.

However mapping msgpack nil to "undefined" don't looks as best solution.

I tried to fix error another way so, that 0xc0 (nil) maps to null but it's not easy.
Null evaluation as end of stream is hardcoded in readable-stream.
function readableAddChunk of _stream_readable.js has following code:
...
if (chunk === null) {
state.reading = false;
onEofChunk(stream, state);
}
...

Any ideas how to fix this error?

Inspect tryDecode in decoder.js alongside readableAddChunk in _stream_readable.js. Reproduce decoding a 0xc0 byte in a msgpack stream and verify that nil is returned as null without being treated as end of stream; the issue provides no test file to run.