debug.getupvalue (func, up)

This function returns the name and the value of the upvalue with index up of the function func. The function returns nil if there is no upvalue with the given index.

EVERYTHING
The Debug Library
debug.debug
debug.getfenv
debug.gethook
debug.getinfo
debug.getlocal
debug.getmetatable
debug.getregistry
debug.getupvalue
debug.setfenv
debug.sethook
debug.setlocal
debug.setmetatable
debug.setupvalue
debug.traceback

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