Module.print caller should check for catch exceptions / warn about them?

I have a very strange problem.

`Module.print(text)` argument keeps accumulating, i.e.
- first call, text = `"abc"`, true message `"abc\n"`
- second call, text = `"abcdef"`, true message is `"def\n"`

In native compiled version, all is good.

I'm still in the process of debugging. It seems some buffer is not being flushed internally by Emscripten...