We previously had a scheme where functions that had a _ty suffix would return a Type<'db>. This has been broken in a few places, for example:

• bindings_ty which returns a Symbol<'db>
• declaration_ty which returns a TypeAndQualifiers<'db>

We should probably clean this up, i.e. either come up with new suffixes, with entirely new function names, or decide that we don't want to do anything about it.