sebastienros/jint — pull request #117 by ala53 (2014-11-26 22:36:43+00:00)
Title: Modifications to LastIndexOf to improve performance.

This is in reference to http://stackoverflow.com/questions/26954728/jint-extremely-slow-with-strings/27133585.

Basically, Jint's implementation of LastIndexOf is extremely slow and this should help.