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First, let me say: Very cool.

But now a quibble.

You removed lua_cpcall on the basis that it was redundant. Note, however,
that lua_cpcall catches errors from the case where there is no room to push
the function and the light userdata.

To really make it redundant, I think one would need something like the

1. Support for testing whether space was available on the stack without

2. Support for "light C functions" -- i.e., functions that could be
represented purely as TValues rather than as garbage collectable entities.

Then one could check for stack space for the two items, push a light C
function and a light userdata, and then execute the pcall.