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> An API function for getting upvalues does not exist (yet). Sorry.
> What do you need it for?
> --lhf

I wrote about this in "pushcclosure / tocfunction issue", 2000-Oct-7.
Roberto said he'd consider it for 4.1.  I made a 4.0 patch for it which only
works for C functions, but can easily be changed to support Lua functions