From:  "Fitzgerald, Nick" <nfitzgerald@mozilla.com>
Date:  08 Feb 2014 01:38:56 Hong Kong Time
Newsgroup:  news.mozilla.org/mozilla.dev.js-sourcemap
Subject:  

Re: Make the file property useful

NNTP-Posting-Host:  63.245.216.66

Also, we should think about backwards compatibility, and this should
probably be a new property, rather than `file`.