miekg/dns — pull request #149 by DanielMorsing (2014-11-06 13:52:12+00:00)
Title: Reduce amount of work done when unpacking unprintable characters.

Instead of going through the fmt package, we can use append int,
which saves an allocation.

benchmark old ns/op new ns/op delta
BenchmarkUnpackDomainNameUnprintable 2147 506 -76.43%