Prevent potential size overflow and 0 length PATCH #556
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note: i'm not sure how to reproduce or even test this. and i'm not even sure if this is the correct solution, but I saw some code that I thought could be buggy.
alternatively we could throw an error if
sliceSize < 0
oroffset > this._size
, because that could indicate a logic issue.see discussion in https://community.transloadit.com/t/how-to-abort-hanging-companion-uploads/16488/10