Could methods of the Any trait object be generalized?

#1

Could the methods of std::any::Any be soundly generalized like this?

pub fn is<U: Any + ?Sized, T: Any>(this: &U) -> bool;
pub fn downcast_ref<U: Any + ?Sized, T: Any>(this: &U) -> Option<&T>;
pub fn downcast_mut<U: Any + ?Sized, T: Any>(this: &mut U) -> Option<&mut T>;

The main motivation is to allow the downcast methods to be used on other traits that have Any as a supertrait, without the need for workarounds such as https://crates.io/crates/mopa

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closed #2

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