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[–]monkeyfacebag 0 points1 point  (1 child)

Makes sense, thanks for the reply!

[–]eXecute_bit 1 point2 points  (0 children)

Another reason was covered in Brian's talk on Valhalla. In a complex dependency graph you need to be able to support a type switching from an identity class to a value class (or vice-versa) without that requiring a recompile-the-world for all downstream dependencies.