new / try_new / new_unchecked

[gatesn]

It's misleading to have new() call try_new().unwrap() since it obscures the lack of safety.

I'd propose we have a new_unchecked and new() Result<...> where unchecked can be used as an optimisation, otherwise the caller can explicitly call new().unwrap() and therefore it's obvious that it can panic.

[robert3005]

Unchecked is usually used to mean unsafe, i.e. this can succeed but still be wrong. I would say we should kill the new methods and just keep try new

[robert3005]

We have mostly got rid of try_new.unwrap. I think we should enforce no random unwraps