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Thomas Harning Jr. wrote:

I've seen setting fenv on userdata recently on the list,
but I haven't seen anything on how it works...
It it something that is just a place to throw data (such
as dependencies), or does it serve as something else like
fenv works on threads and functions...

From the manual:

Environments associated with userdata have no meaning for
Lua.  It is only a convenience feature for programmers to
associate a table to a userdata.