Code Review for R45 - Githubissues

Purpose of code changes on this branch:
To enable unification error messages to pinpoint the exact location in the 
input of the offending variable.  This is with an eye towards auto-correction 
in the future.

When reviewing my code changes, please focus on:

The change is pretty minor, but at the same time invasive, because there were 
so many instances of "typeof foo == 'string'" and "foo === bar".  The latter 
fails when foo is a String() and bar is a string; i.e. new String("foo") !== 
'foo', even though with only two equals it works.  I just changed all === to == 
and !== to !=, since I didn't see any reason why they should be using ===, and 
it seemed silly to be using == for strings and === for everything else.  Please 
let me know if there are subtle places in the code that rely on ===.

After the review, I'll merge this branch into:
/trunk

Original issue reported on code.google.com by abliss on 6 Aug 2010 at 4:31

raphlinus / ghilbert

Code Review for R45 #1