container/heap: optimization when selecting smaller child
In down(), if two children are equal, we can choose either one. Inspired by https://codereview.appspot.com/6613064/ Change-Id: Iaad4ca5e2f5111bf3abb87f606584e7d274c620b Reviewed-on: https://go-review.googlesource.com/38612 Run-TryBot: Robert Griesemer <gri@golang.org> Reviewed-by: Robert Griesemer <gri@golang.org>
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