jquery/jquery-ui — pull request #1172 by justinwinslow (2014-01-14 20:50:42+00:00)
Title: Add quotes to data URI

Depending on the options you set, Stylus will try to parse the URL as a path and throw an error. In quotes it takes it as literal. This is mostly a nice-to-have for me, not necessarily critical if there is a good reason to leave it as-is.