6.8 cmpcache -- Efficient file comparisons

The cmpcache module provides an identical interface and similar functionality as the cmp module, but can be a bit more efficient as it uses statcache.stat() instead of os.stat() (see the statcache module for information on the difference).

Note: Using the statcache module to provide stat() information results in trashing the cache invalidation mechanism: results are not as reliable. To ensure ``current'' results, use cmp.cmp() instead of the version defined in this module, or use statcache.forget() to invalidate the appropriate entries.

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