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by WastingMyTime89 1277 days ago
It's influential but the most is stretching it.

It showed that monads can be used to isolate I/O but have a very real cost when it comes to complexity, that laziness by default is a bad idea and that typeclasses are a good way to introduce ad hoc polymorphism.

Definitely a good result for a research language but far less ground-breaking than ML was (admittedly putting the bar very high).