joyent/node — comment on commit 007b7181e307a8d52970947d2b6432a2addd9ef0
File:  line 0
By visionmedia:

@bnoordhuis it's been the same since I can remember in v8, not that it's necessarily stable but I cant recall it changing at all yet

looks like it's been the same since 2010 http://code.google.com/p/v8/wiki/JavaScriptStackTraceApi