Switch to @msgpack/msgpack-javascript

[fonsp]

Right now we are using https://github.com/kawanet/msgpack-lite for the JS side of our MsgPack protocol, or actually, my fork fonsp/msgpack-lite@6990011 where i directly edited the .min.js bundle to become an ES6 file 😅

It's working great, and I think it is quite fast.

We could switch to https://github.com/msgpack/msgpack-javascript , which is being actively developed, and more modern: it is written for ES6.

[fonsp]

Since this is performance-sensitive, we need a benchmark before making the switch

[fonsp]

Simon Danisch was working with https://github.com/msgpack/msgpack-javascript and he found that they avoid some allocations: e.g. when part of a message is a Uint8Array, that array will actually have a larger buffer as underlying data, but it uses the byteOffset and byteLength.

Our package gives the buffer already sliced, which must mean that we have more allocations! 🙄

[fonsp]

According to their benchmark, they have a 2-3x performance increase compared to msgpack-lite!

They also have streaming API (using https://web.dev/streams/ ?) which should give even more speedups.