Is there *any* valid excuse for Dart's decision to be unsound around variance?
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Replying to @BrendanEich
@BrendanEich But variance isn't hard. I don't understand why you'd cut that corner.1 reply 0 retweets 0 likes -
Replying to @BrendanEich
@BrendanEich Not really, just use + and - like Scala. This is a solved problem IMO…2 replies 0 retweets 0 likes -
Replying to @pcwalton
@pcwalton@BrendanEich Variance may have been theoretically solved, but it's still tricky for users http://stackoverflow.com/questions/676615/why-is-scalas-immutable-set-not-covariant-in-its-type …2 replies 0 retweets 0 likes
Replying to @rafaeldff
@rafaeldff @brendaneich That looks like a particular problem with other features of Scala (sets as functions), not with variance…
9:17 AM - 2 Dec 2013
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