Should have audits for accepting `null`s

[glasser]

The spec has a paragraph that states:

Note: Specifying null in JSON (or equivalent values in other formats) as values for optional request parameters is equivalent to not specifying them at all.

The audit suite should test this explicitly.

(I was inspired by the audit suite to be stricter about banning things like variables: 0 and got carried away and also banned variables: null. So the suite should prevent this over-fitting.)

[enisdenjo]

🎉 This issue has been resolved in version 1.9.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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