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E.g. if you define an opaque type + flatMap is very different from a class + a flatMap method.
The later can specify a flatMap method with a more flexible signature than Monad.flatMap, whereas the former cannot do it.
Kind of pisses me off 
I imagine there would be an unacceptable performance hit if extension methods were considered as potentially higher-priority than class methods for every call, but there might be ways to optimize this.
I can see the annoyance, though it might be surprising if calling `flatMap` on a value whose type is able to infer an extension method did something different from calling `flatMap` on the same value when its in a generic context and the extension can't be used.
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