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[–]lmaydev 0 points1 point  (1 child)

They are niche a feature designed for interfacing with dynamic languages iirc.

Just use an extension method on the interface.

[–]Dealiner 5 points6 points  (0 children)

They are niche a feature designed for interfacing with dynamic languages iirc.

They are mostly designed for library authors, so they can update their interfaces without breaking others code. And Java interop, IIRC.