Expand Debug for Mutex<T> implementation to unsized T
#4134
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This follows precedent of e.g. the standard library. Adds a level of indirection in order to still be able to coerce the argument to a
&dyn Debug.I tried to do an exhaustive search, AFAICT this seems to be the only type in this repo with an
?Sizedtype argument that has a too restrictive (<T:) impl for Debug.?Sized>