Datoms that differ only by :added key are considered equal

[tomconnors]

(= (datascript.core/datom 1 :a "v" 500 true) (datascript.core/datom 1 :a "v" 500 false))
;; => true

Is this expected?

[tonsky]

I don’t remember at this point. What does Datomic do?

[rauhs]

Datomic doesn't make them equal unless the T is also equal:

(:import (datomic.db Datum))
(= 
  (Datum. 0 5 "f" 1)
  (Datum. 0 5 "f" 3))
;; => false

Notable: It uses the :db/id of the attribute in the Datom. And they use the lowest bit to encode assertion vs retraction.