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Internal file numbering management either looks for a block of available file numbers or looks to see if a given file number heads up a sufficiently large block of available file numbers. An opportunity was found to improve the loop that steps over file numbers looking for a block of file numbers. Instead of stepping through the loop sequentially one file number each time, those file numbers that cannot possibly work because a particular file number is unavailable are skipped, and will be unavailable for all starting file numbers up to and including this particular file number.
