# Objective
Related to #17784. The ticket is actually about just getting rid of
`Entity{Ref,Mut}Except` in favor of `FilteredEntity{Ref,Mut}`, but I got
told the unification of Entity types is a bigger endeavor that has been
going on for a while now (as the "Pointing Fingers" working group) and I
should just add the functions I actually need in the meantime.
## Solution
This PR adds all of the functions necessary to access components by
TypeId or ComponentId instead of static types.
## Testing
> Did you test these changes? If so, how?
Haven't tested it yet, but the changes are mostly copy/paste from other
implementations in the same file, since there is a lot of duplicated
functionality there.
## Not a Migration Guide
There shouldn't be any breaking changes, it's just a few new functions
on existing types.
I had to shuffle around the lifetimes in `From<&EntityMutExcept<'a, B>>
for EntityRefExcept<'a, B>` (originally it was `From<&'a
EntityMutExcept<'_, B>> for EntityRefExcept<'_, B>`) to make the borrow
checker happy, but I don't think that this should have an impact on user
code (correct me if I'm wrong).
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