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On Sat, Sep 24, 2022 at 3:51 AM Sean Conner wrote:
                  -- XXX might want to double check that _ENV ius always the
                  -- first upvalue.  Or cycle through any upvalues, looking
                  -- for a table that is equal to the current _ENV.
                  -- ----------------------

It is impossible to determine the index of the _ENV upvalue of a function with debug info stripped.

local env = _ENV
local function f()
   if env then
print(debug.getupvalue(f, 1)) -->  env   table: 0x55ee9bd89c50
print(debug.getupvalue(f, 2)) -->  _ENV  table: 0x55ee9bd89c50