tree 3c31bbead00b5405ccf58c6cc01f5b9003e77348
parent 7a77d8d1e9b006ae49fd456a8912a8ec03af8ec7
author Robert Griesemer <gri@golang.org> 1423860464 -0800
committer Robert Griesemer <gri@golang.org> 1423874525 +0000

math/big: fix aliasing error in Add, Sub

Also:
- make representation more flexible (no need to store trailing 0 digits to match precision)
- simplify rounding as a consequence
- minor related fixes

TBR adonovan

Change-Id: Ie91075990688b506d28371ec3b633b8267397ebb
Reviewed-on: https://go-review.googlesource.com/4841
Reviewed-by: Rob Pike <r@golang.org>