Indeed, thanks for spotting that, as I myself remember discovering there's at least two. Thing is, I had learned and started with Mike Farah's `yq`, not the pass-through-to-`jq` variant written in Python that's often more easily (read: system package manager) available. Both semantics and syntax are a bit different between the two.

A bit of a fun fact: there's a quote by Farah where he said that the language and semantics of the tool he was writing, didn't really "click in" until he was well into writing it :-) I myself have been on occasion pulling my hair out trying to wield `yq`'s language, there's some inconsistencies here and there which I think are related to the novel nature of the language (not novel to everyone but it's uncommon even for those well versed with e.g. SQL). `jq` suffers from similar woes, but to a lesser degree.