kangax/fabric.js — pull request #1199 by nevernormal1 (2014-02-25 20:01:35+00:00)
Title: Initialize variable with the correct name that is actually used

The initDoubleClickSimulation was initializing a variable called "lastPointer" but no such variable is ever used. The variable used is named "__lastPointer" and if it's not initialized, it's possible for fabric to blow up.