mozilla/pdf.js — pull request #4187 by Rob--W (2014-01-25 15:59:39+00:00)
Title: Replace [] with {} in core/cmap

Upon further inspection, the "map" property in cmap is a sparse array.
`readToUnicode` in core/evalutor walks over all properties using a for-..-in loop, which suggests that "map" should really be a kind of dictionary, and not an array.

Fixes #4183.