toJSON utility for deep jsonification

[NullVoxPopuli]

tc39/proposal-signals#164 (comment)

Context ^

[vospascal]

i would love to be able to stringify a whole data structure including signals, so support for this would be nice.
i understand its not default because map and sets also dont have this, which would also have been nice.

the api like toPrimitive might also be an option like used here https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/toPrimitive

i saw WebReflection also mentioning it now sorry for extra post