public @NonNull SuggestionMapper<? extends Suggestion> suggestionMapper() {
        return this.mapper;
    }
Returns the suggestion mapper for {@link #suggestionFactory()}.

<p>Platform command managers may replace the default mapper to better support
platform suggestion types. Therefore it's encouraged to chain any additional mappers using
{@link SuggestionMapper#then(SuggestionMapper)} or {@link #appendSuggestionMapper(SuggestionMapper)},
rather than replacing the mapper directly.</p>

@return the suggestion mapper
cloud-core/src/main/java/org/incendo/cloud/CommandManager.java