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detect struct stat.st_dev's size and signedness, and return it safely
On FreeBSD dev_t (and hence the st_dev member of struct stat) is an unsigned 64-bit integer, and the previous simple PUSHi() corrupted that. A previous version of this reflected the st_ino code and implemented our own number to string conversion, but a system with such a large st_dev should be assumed to have inttypes.h, and an intmax_t which is no smaller than st_dev. The st_ino code could probably be changed similarly, but 64-bit inode numbers are not a new thing, so it may be riskier.
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