Khan/khan-exercises — pull request #23103 by beneater (2012-06-01 18:28:02+00:00)
Title: Modify method of hashing VARS for detecting duplicate problems

@divad12

The Firefox 3.6 implementation of JSON.stringify() seems to
operate recursively regardless of what the replacer function
returns. It seems the replacer function only modifies how
each element is encoded; it doesn't limit recursion. Thus
some exercises were broken when using FF 3.6.