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"""Create a new file id suffix that is reasonably unique.
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On the first call we combine the current time with 64 bits of randomness to
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give a highly probably globally unique number. Then each call in the same
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process adds 1 to a serial number we append to that unique value.
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# than having to move the id randomness out of the inner loop like this.
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# XXX TODO: for the global randomness this uses we should add the thread-id