returns the list of additions in this mutation concode_field_sep List<E> additions concode_elem_sep List<K> deletions concode_field_sep List<K> getDeletions concode_elem_sep void deletion concode_elem_sep void merge concode_elem_sep boolean hasDeletions concode_elem_sep boolean hasAdditions concode_elem_sep void addition
List < E > function ( ) { if ( additions == null ) return ImmutableList . of ( ) ; return additions ; }