I think in many cases you could deal with the non-existence of a file passed to #FILEAGE as a parmeter if there were a way to get a non-existent file to return Long.MIN_VALUE. logic can treat a non-existent file as a badly out of date file.
Whereas the @FILEAGE of an existing file is always a non-negative integer, the return value string -1 could be used as an error indicator for a non-existent file, same as @CRC32 would.
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