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The only changes in the language from beta to final were these:

- integer division became floor division. (y//y == floor(x/y); like the
other arithmetic operators, if x and y are integers the operation is
performed on integers and the result is an integer; otherwise, the
operation is performed on floats and the result is a float.)

- new function string.packsize

- new option '=' in pack/unpack (default endianness)

- option 'c' in pack/unpack needs an explicit size

-- Roberto