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> Cool. Now, since setfenv is totally possible, I like the _ENV :)
> Here are my implementations of setfenv and getfenv:
> [...]

As far as I can see, the only missing detail of these functions (except
for occasional bugs) to achieve 100% compatibility is the case of
'getfenv' over a function that does not have an _ENV variable (that is,
it uses no globals).

We could use a weak table to keep the environments of these functions
when set by setfenv, but that still misses the case of a function
without _ENV that was not subjected to setfenv.

-- Roberto