Package mmap allows mapping files into memory. It tries to provide a simple, reasonably portable interface, but doesn't go out of its way to abstract away every little platform detail. This specifically means:

* forked processes may or may not inherit mappings
* a file's timestamp may or may not be updated by writes through mappings
* specifying a size larger than the file's actual size can increase the file's size
* If the mapped file is being modified by another process while your program's running, don't expect consistent results between platforms

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