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ASN.1 uses the name DER Distinguished Encoding Rules for this purpose.

There are some other edgecases that you aren't considering (or that I missed)

Min and Max integer values - JavaScript has some pretty tight limits here

Keys should be in lexicographic order — you might want to be more specific. Is there a permitted subset of Unicode? Which normalization rule must be used?

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There's an issue for min and max number values here: https://github.com/seagreen/Son/issues/3

Son seems like a natural place to put restrictions on them, but I'm not sure if there's way to do it that (A) still makes for a clean spec and (B) still allows everything floats can encode to to be used.

Yeah, as with the trailing zero, you're being burned by JavaScript's decision to just have a Number type. As far as js is concerned 1 and 1.0 are the same number.

On an unrelated note. If human readability isn't a primary concern, I'd recommend requiring that < > & all be escaped, this prevents some crappy attacks

Also, no top level lists!

Why no top level lists?

Ha! I guess I'm showing my age. There used to be an associated vulnerability, which is why some frameworks won't let you do it. It appears that the vulnerability was fixed in what are now fairly old versions of browsers.

More info at http://stackoverflow.com/questions/16289894/is-json-hijackin...

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