Does anyone know of techniques to specialize on Copy specifically in stable Rust? I am currently using the typeid crate to test whether a type is one of a known set of Copy types that are likely to be used with my library. Reading the Rust issues I have seen mentions of some libraries using hacks which rely on the fact that some standard library methods won't call the Clone impl for a type if it also implements Copy, but this is a cause for sadness amongst the stdlib maintainers.

(Edit: Fixed issue link)

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