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John Passaniti wrote:
2.  The function that transforms the string literal takes some
non-zero amount of time to process.  Typically this is going to be a
call to gsub.  That's generally pretty efficient, but still far more
expensive than a LOADK instruction.  Consider what happens if the
transformation function is called inside a loop that executes many

Also, in embedded systems (where a hex constant notation would probably be desirable) the string library could be unavailable due to space/time/gc constraints, so gsub could not be used.