Decide which auto traits the raw views should implement

[bluss]

Decide which (if any at all) of the auto traits the RawArrayView/Mut should implement.

That is Send, Sync, and many more.

[jturner314]

For Send and Sync, I think the nomicon makes a good argument to not implement Send and Sync for pointer-like types (like RawArrayView/Mut):

However raw pointers are, strictly speaking, marked as thread-unsafe as more of a lint. Doing anything useful with a raw pointer requires dereferencing it, which is already unsafe. In that sense, one could argue that it would be "fine" for them to be marked as thread safe.

However it's important that they aren't thread-safe to prevent types that contain them from being automatically marked as thread-safe. These types have non-trivial untracked ownership, and it's unlikely that their author was necessarily thinking hard about thread safety.

https://doc.rust-lang.org/nomicon/send-and-sync.html

It would probably also be a good idea to not implement Send/Sync on RawArrayView/Mut just for consistency with *const T/*mut T.