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In Postgres you can define custom operators via `create operator`[0]

    -- infix
    select a <!!!> b;

    -- prefix
    select <||> a;

A lot of custom types end up using this [1].

    select @-@ '[(0,0),(1,0),(1,1)]'::path;
    -- 2

[0] https://www.postgresql.org/docs/current/sql-createoperator.h... [1] https://www.postgresql.org/docs/current/functions-geometry.h...