`const` `VecDeque` initialiser

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I need to initialise a VecDeque in a const context, but VecDeque::new is not const. However, Vec::new is const. Vec and VecDeque are quite similar under the hood; is there anything stopping VecDeque from having a const initialiser?

If it is possible, how would I go about adding a PR to Rust, would I need to discuss it with someone prior? I've noticed other const functions have a rustc_const_stable attribute suggesting it's not as trivial as just adding the const keyword.

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Current implementation does heap-allocate in new and has a concept of a minium capacity:

so it's harder than just declaring new const. You'd have to change the implementation to tolerate zero capacity.

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