This got me curious, and yeah it turns out Elm's dictionary implementation uses values, not pointers when retrieving values. elm repl ---- Elm 0.19.1 ----

This got me curious, and yeah it turns out Elm's dictionary implementation uses values, not pointers when retrieving values. elm repl ---- Elm 0.19.1 ---------------------------------------------------------------- Say :help for help and :exit to exit! More at <https://elm-lang.org/0.19.1/repl> -------------------------------------------------------------------------------- > import Dict exposing (Dict) > nan = 0/0 NaN : Float > nan NaN : Float > nan == nan False : Bool > naan = 0/0 NaN : Float > d = Dict.fromList [(nan, "a"), (naan, "b")] Dict.fromList [(NaN,"a"),(NaN,"b")] : Dict Float String > Dict.toList d [(NaN,"a"),(NaN,"b")] : List ( Float, String ) > Dict.keys d [NaN,NaN] : List Float > Dict.get nan d Nothing : Maybe String > Dict.get naan d Nothing : Maybe String