v1.11.5
`AnnotatedString`: add concrete type asserts to `isvalid`, `ncodeunits` (#57607)
strings: type assert in the generic `nextind`, `prevind` methods (#57608)
implement Memory{T} as a new backend for Array{T} (#51319)
`Base`: `macro b_str`: restrict argument to `String` (#57863)
Fix LazyString building with non-ASCII preceding $ (#49248)
Use optimised string search methods for substrings, too (#52424)
Revert "Revert "Cleanup MemoryRef tests (#54681)""
Rename (Tagged → Annotated)String, etc.
Make concatenation of SubString{AnnotatedString} preserve annotations (#51806)
Add test for upper/lower/titlecase and fix missing import (#55443)
Use StringMemory instead of StringVector where possible (#53962)