piscisaureus

Locate the section for your github remote in the .git/config file. It looks like this:

[remote "origin"]
	fetch = +refs/heads/*:refs/remotes/origin/*
	url = git@github.com:joyent/node.git

Now add the line fetch = +refs/pull/*/head:refs/remotes/origin/pr/* to this section. Obviously, change the github url to match your project's URL. It ends up looking like this:

getify

/*

To see a demo of these in use, check out: http://test.getify.com/test-canvas-clear-alt.html

Example uses:
*/

clearCircle(context,/*x=*/120,/*y=*/80,/*radius=*/60);
clearLineSquared(context,/*x1=*/10,/*y1=*/10,/*x2=*/53,/*y2=*/67,/*thickness=*/5);
clearLineRounded(context,/*x1=*/15,/*y1=*/100,/*x2=*/90,/*y2=*/170,/*thickness=*/10);