Server trait usability fixes #484
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…TypeParameter = ...>) to prevent intermediate types that impl the trait from not themselves allowing the default type parameter to be overridden. - Move common bounds up from implementers of the Service trait to the Service trait itself. This both reduces boilerplate and reduces the chances of a type having stricter bounds on the struct and fns (such as fn new()) than its Service trait impl, making it hard to find the cause of a bounds mismatch. - Align bounds on all middleware struct blocks to match the bounds on the Service trait impls to catch mismatched bounds earlier. - Remove unnecessary ?Sized bound on impl Service for U where U: Deref.
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I've marked this PR as DRAFT because I need these changes for something I'm testing but I don't actually know if they are needed, or correct, at this point.
Remove defaults from trait generic type parameters (i.e. TraitName<TypeParameter = ...>) to prevent intermediate types that impl the trait from not themselves allowing the default type parameter to be overridden.
Move common bounds up from implementers of the Service trait to the Service trait itself. This both reduces boilerplate and reduces the chances of a type having stricter bounds on the struct and fns (such as fn new()) than its Service trait impl, making it hard to find the cause of a bounds mismatch.
Align bounds on all middleware struct blocks to match the bounds on the Service trait impls to catch mismatched bounds earlier.
Remove unnecessary ?Sized bound on impl Service for U where U: Deref.