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Basically, when a type implements some trait both specifically and as a blanket impl, Rust can't decide which one to use. Intuitively, we would want to use the specific implementation since it's usually going to be faster/better. There is a specialization RFC that would allow the code in my playground to compile and work as expected: https://github.com/rust-lang/rfcs/pull/1210
With a subset of specialization likely riding the trains soon and a workaround available, why would you give up?
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