joyent/node — pull request #6550 by divec (2013-11-20 18:41:16+00:00)
Title: util: Format negative zero as '-0'

Format negative zero as '-0' instead of as '0', as it does not behave
identically to positive zero. ((-0).toString() still returns '0' as
required by ES5 9.8.1.2).

Fixes joyent/node#6548