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The question is, where that limit comes from.. It sounds weird. 40bit file size record? like why?

I recently was fixing my own tool here and had to shufle some fields. I settled up at 48bit file sizes, so 256TB for single file. Should be enough for everyone ;)

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It sounds like an arbitrary limit set by some engineer without too much thought and without the incentive to document their decision. I do this sometimes as well when dealing with untrusted data. Sometimes you don't want to have to think about the knock on effects of supporting large file sizes and it's easier to just tell the client please don't do that.

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