[jQuery] What does === equate to?

[jQuery] What does === equate to?


I am getting a exception when jquery is processing a successful ajax
call on line 339 of the most recent release:
if ( fn.apply( obj[i], args || [i, obj[i]] ) === false ) break;
The error is that fn is void, and the onreadystatchange function,
catches the exception and changes the status from success to an
error.
I am trying to dissect why this is happening (the responseText is
fine) and cannot figure how what the heck === is.