number: added number package provides more styles and more control over formatting than fmt. Change-Id: Ib9d2c27db14804af911556e3caa8b35fddd32fce Reviewed-on: https://go-review.googlesource.com/59812 Run-TryBot: Marcel van Lohuizen <mpvl@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Nigel Tao <nigeltao@golang.org>