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List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.devel:312729 Archived-At: On Tue, Nov 14, 2023 at 12:20=E2=80=AFPM Dmitry Gutov wr= ote: > > On 14/11/2023 14:14, Jo=C3=A3o T=C3=A1vora wrote: > >> The way I understand this, is any new sequence type has to implement > >> seq-do. As soon as that happens, a lot of (probably all) sequence > >> functions in seq.el start working on that type. > > Right. But seq-difference-3 doesn't call into seq-do anymore, > > at least not always and not in the same way. So today,_before_ > > your seq-difference "skips-the-seq-do" optimization, a given person's > > set difference operations would work just fine for their custom > > data type. The person is happy and doesn't care about seq.el's > > performance. > > seq-difference-3 calls seq-filter which calls seq-map, which in turn > delegates to seq-do OK, but not always in the same ways as seq-difference did, and not always in the same way for different predicates. And and not for sequences of type sequence and list, so if I have special method on seq-do for my FUNCTION argument, it will not be called. Jo=C3=A3o