joyent/node — pull request #6393 by seanmonstar (2013-10-22 00:53:03+00:00)
Title: util: format to not inspect strings if first argument is non-string

current:

util.format('a', 'b'); // "a b"
util.format({}, 'a', 'b'); // "{} 'a' 'b'"

changed to:

util.format('a', 'b'); // "a b"
util.format({}, 'a', 'b'); // "{} a b"