Sorry, got tangled up in this thing called 'real life'.
If I understand you correctly, you want a prefix match, and sure there's a PostgreSQL extension for that:
OK, that seems to do the job, thanks a lot. The only small quibble is that it's an extension.
I'm quite surprised there seem to be no way in core to treat an array as an array. Using @> treats it as a set, AFAICT.
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