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Note that F# has the `[<NoEquality>]` attribute for exactly that sort of case.

• masklinn 6y ago
  That's the wrong default though. There is no reason to assume equality is a sensible concept, so objects should not even be equatable by default, and you could have an attribute which gives them structural equality (with a third option of a full-blown custom equality if necessary) as e.g. Haskell or Rust handle it.
  • joshsyn 6y ago
    Alzabraic types and records have strutural equality while classes don't have it I believe.