Yuri D'Elia <wavexx@thregr.org> writes: > > What's your POV on this? Is it expected/useful in some scenario? > > I'd expect all terms to follow the same rules for consistency. For terms where each document (mail message) has only one term with a given prefix, OR is a more natural default, since AND can never match. In notmuch we have id:, path:, and thread: of this type (and maybe lastmod: and date:, although these are not boolean prefixes), compared to tag: where each document can have many terms with the same prefix. Making tag: behave differently than the others is probably not that nice either, so mostly I'd suggest explicitly writing what operators you want. d