I imagine it depends on your aims. If your aim is just to document existing behavior, that's one thing. But if your aim is to create a new, simple, data interchange format, documenting existing implementations is only going to limit its usefulness. It could have forced the current implementations fixed instead of setting the bar.

As pointed out upstream, we're dealing with a lot of data these days, and such limitations will only cause JSON to become marginalized or complicated with implementation-dependent workarounds, like integers in strings.