Strings returned by asciiDebug() should be NULL-terminated.
Created attachment 65906 [details] Patch
Is our style to have a space to make it "length + 1"? The style bot didn't notice any issues, but I wasn't sure.
Brian, I think you're right. I'll fix that before landing.
Committed r66401: <http://trac.webkit.org/changeset/66401>