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> Uncommenting this line leads to a failed assert in traversestack()
> (line:245 / lgc.c) while still in openstdlibs above.

This is a bug :(  The patch is

* lgc.c:
<     if (!(ci->state & CI_C) && lim < ci->top)
>     if (lim < ci->top)

What is happening is that, in a garbage collection, Lua may shrink the
stack more than it should (that is, after the gc the stack may not have
that extra space that you asked).

-- Roberto