>  if there's any future intention to add a delete operator that removes
element/pair matches?

I think the operator (jsonb - jsonb) is logical because we have a shallow
concatenation function (something like a "union" operation), but we have
nothing like "set difference" and "intersection" functions. Actually, I
thought to implement these functions (at least for jsonbx). But of course
this function should be quite simple and consider only full key/value
matching as a target.

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