Don't emit duplicate subsequent occurrences #194
Merged
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Fixes #152. Supersedes #192. This fix doesn't prevent duplicate non-subsequent occurrences but that's fine because there are no functional differences between having more than one identical occurrences. It's still desirable to skip duplicate occurrences because 1) it makes the snapshot tests easier to review and 2) reduces the final index size, although I suspect it won't make a practical difference for the payload size.
Test plan
See updated snapshot tests.