Incorrect results if Date#toJSON is specified but not the JSON object.

[jdalton]

I noticed that if I include json2.js on a page that doesn't have the JSON object but does have Date#toJSON specified I get incorrect output from JSON.stringify().

Here is a simple example:

JSON.stringify(Object('hi')); // should return '"hi"' but returns '{"0":"h","1":"i"}'

[jdalton]

I also noticed it happening if a script on a page removes the non-spec'ed String#toJSON method that json2.js adds.

[douglascrockford]

Then don't do that.