missing runtime methods for allocating arrays about box2d.js HOT 4 OPEN

Also if these are missing, are there other things from the preamble that we should be exporting? Might be best to check them all at once.

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Yeah, emscripten now requires explicit exporting of runtime methods. We should add any of those that are mentioned in the docs as working, I guess.

Do we mention allocate, though? That's an internal API I hope isn't used outside of core emscripten code.

And getValue/setValue are kind of slow - may be better to document using Box2D.HEAPF32 or such.

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They're used in the helpers, for building chain and polygon shapes. Here.

I guess it's more of an Emscripten issue, but if there's another way to allocate arrays it's not documented well. I guess it could export C's malloc.

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I see, thanks. Yeah, malloc would be a much better option to use here (faster too).

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