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Roberto Ierusalimschy wrote:
> You can use the debug API to know the number of upvalues of a function
> (although we do not recomend the use of debug facilities in "normal"
> code), or else use Daniel Remar's sugestion.
> -- Roberto

Just for clarity, I'm Björn De Meyer. 
Daniel remar is my pen pal whose quote I use.

"No one knows true heroes, for they speak not of their greatness." 
    -- Daniel Remar.

Björn De Meyer