From:  Evan Wallace <evan.exe@gmail.com>
Date:  31 Jul 2013 02:17:44 Hong Kong Time
Newsgroup:  news.mozilla.org/mozilla.dev.js-sourcemap
Subject:  

Proposal: forbid duplicates in "names" and "sources"

NNTP-Posting-Host:  63.245.216.66

Mozilla's source map implementation assumes the "names" array contains
unique names, but this is not in the spec and the TypeScript compiler
sometimes generates duplicate names. This prevents some TypeScript source
maps from being read by Mozilla's source map library. One way to fix this
is to require that "names" (and "sources") only contain unique strings.
Thoughts?

More info: https://github.com/mozilla/source-map/pull/72