Checkin release notes
Support hex characters in format strings
Use digittoint() instead of std::stoi()

Both because of performance and because the latter can throw an exception (although we check the input, so it should not happen with our use of the API).
Don’t dereference end-of-range iterator
Add missing “is content scope” argument
Rename API to make searching easier

Using generic names like ‘append’ is not good when analyzing code for potential refactoring.
Fix retain cycle
Add new API for mutating scope_t
Use new scope_t API
Watch leaks for grammar_t
Return false from ‘scope_t::operator bool’ when there is no scope
Use public API for scope_t utility functions
Update buffer_t::scopes to new scope_t API
Remove old scope_t API