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debug.getupvalueSYNOPSIS
debug.getupvalue(func,up)
DESCRIPTION
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.
RETURN VALUE
This function returns the name and the value of the upvalue with index up of the function
func.
ERRORS
The function returns nil if there is no upvalue with the given index.