# Objective
Restore the behavior of `Query::get_many` prior to #15858.
When passed duplicate `Entity`s, `get_many` is supposed to return
results for all of them, since read-only queries don't alias. However,
#15858 merged the implementation with `get_many_mut` and caused it to
return `QueryEntityError::AliasedMutability`.
## Solution
Introduce a new `Query::get_many_readonly` method that consumes the
`Query` like `get_many_inner`, but that is constrained to `D:
ReadOnlyQueryData` so that it can skip the aliasing check. Implement
`Query::get_many` in terms of that new method. Add a test, and a comment
explaining why it doesn't match the pattern of the other `&self`
methods.