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SSIZE_MAX must accurately reflect the ssize_t type. It is presently incorrect on all 64-bit platforms. On every platform I am aware of, ssize_t == long int (i.e. 32 bits where long is 32 and 64 bits where long is 64). So it would not hurt to generically use LONG_MAX, and that would be simpler. I think it is a valid assumption at the moment that long == wordsize. If not, we could also have SSIZE_MAX defined conditional on __WORDSIZE, which is still simpler than adding a specific definition for particular platforms.
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