Ian keeps suggesting this in comments for my events stuff so making a ticket. Proposed places so far:

sub load_meta in Data::$Entity (MBS-7777)
%TYPE_TO_DATA_CLASS in Data::Search
%model_to_search_hint_type_id (and more) in Controller::Role::Alias (see also MBS-7755 for template-related search hint usage)
%relation_types in WebService::Validator