Jsonify problems

[frontsideair]

I mentioned in #406 that I was building my own Jsonify. I have a small test suite that I based on the spec and there's a simplified version on MDN.

I put the definition in here and it fails a few cases, namely these:

• Number, String and Boolean should be turned into primitives
• undefined, Function and symbol should make keys to be omitted if they are values in an object
• Function and symbol in an array should turn into null
• symbol keys should be omitted in an object

I can help with these if it aligns with the project goals. My plan would be first add these tests, then fix the current definition to make the tests pass. My current implementation passes the tests, but is not exhaustively tested and it's not as modular as the one in this repo, so I would rather improve this implementation.

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[sindresorhus]

I'm happy to see the Jsonify type become more correct. Pull request welcome :)