This is going to be embarassing if I’m wrong, but it seems like the https://tiddlywiki.com/#Filter%20Operators page doesn’t list the compare operator? I’m trying to unravel the filters that build that page, and so far it’s not obvious to me why it wouldn’t show - must be a combination of filters or something.
The tiddler compare Operator has a lot of tags one tag is String Operators.
The tiddler you linked to has some filters containing !tag[String Operators]
Looks like it was excluded because it’s both a Mathematical operator and String operator. Wonder why there’s all those !tag operators?
Ouch, seems like some work is needed on the “Filter Operators” tiddler. It kind of needs an overhaul anyway because we’ve expanded the number of operators so much. Anyhow, contributions are welcome.
An other name for compare is “match” 