(WebGL) dynCall are deprecated and not working in Unity6 with Wasm23 enabled

[miv]

After transfering game to Unity6 i've discovered that it crashes in WebGL builds with cryptic errors:

10:32:41.453 WebGL_Build.framework.js.br:9 Uncaught ReferenceError: dynCall is not defined
    at connection.socket.onopen (WebGL_Build.framework.js.br:9:150900)
connection.socket.onopen @ WebGL_Build.framework.js.br:9

After some investigation i've found that dynCalls are deprecated and not working when wasm 2023 enabled it seems.

For now i've added jspre file with shim to work around this issue but JsWebSocket.jslib need to be updated to use {{{ makeDynCall('vii', 'callback') }}}(1, 2) as per Unity docs.

My shim based on https://github.com/RageAgainstThePixel/com.utilities.websockets/blob/main/Utilities.Websockets/Packages/com.utilities.websockets/Runtime/Plugins/WebSocket.jspre with global dynCall's added is attached for anyone to use while fix is pending - rename to WebSocket.jspre and put into Plugins/WebGL

WebSocket.txt