Make a single wr.write_all() call, even for negative integers.#8

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SimonSapin wants to merge 3 commits intodtolnay:masterfrom SimonSapin:buffer

+27-12

Commits on Aug 29, 2017

Use a byte literal ASCII 0 instead of its decimal value.
SimonSapin
committed
Include the minus sign in the same buffer, to only make a single write_all call.
SimonSapin
committed
Reduce the amount of code generic on W: io::Write
SimonSapin
committed