A bit awkward to clutter a standard library with too much speculative 
forgiveness of other software's potential failure to follow a spec.  Where 
would it end?

Anyway, the best improvement here would help with all InputStream 
consumers, not just io/copy.  

If you suffer from a faulty InputStream that returns zero when it simply 
does not feel like blocking, couldn't you either fix it or wrap it in a 
"TolerateZeroBytesReadByRetryingInputStream" that blocks until it gets 
something other than zero?

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