Strengthen requirements on optional vocabularies and unknown keywords #1376
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This fixes #1300, and has been posted to clear up confusion over the difference between it and #1294 / #1295.
The explanation is in #1300, and if there is any controversy over this, or a desire to split the the two SHOULD-to-MUST changes to accept one and reject the other, then this draft PR should be closed unmerged and the discussion should take place in issue #1300. If this happens, anyone should feel free to close this- there is no need to check with me first.
This strengthens two SHOULDs to MUSTS: