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Funny story. JSLint[1] does not approve of this technique. I asked Crockford to implement the duplicate check in April 2009 via email. 20 minutes later, out of nowhere, he was done implementing that check and wrote back "Please try it now."

This guy is fast. Especially nice considering we do not know each other at all.

[1] http://www.jslint.com/ - JS checking tool from the inventor of JSON

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I sent him an email once asking for the same JSLint license that he gave to IBM (you know, the one without the "do not use this for evil" clause.)

He responded that he was getting annoyed by everybody asking for this, so it was going to cost me $100K to obtain such a license.

I responded that I only asked for that license in order to annoy him (and thanks for the confirmation that it worked), because his immature license clause is annoying everybody else.

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