RUBY_FL_USER3 915 include/ruby/ruby.h RMODULE_IS_REFINEMENT = RUBY_FL_USER3, RUBY_FL_USER3 938 include/ruby/ruby.h RSTRING_EMBED_LEN_MASK = (RUBY_FL_USER2|RUBY_FL_USER3|RUBY_FL_USER4| RUBY_FL_USER3 989 include/ruby/ruby.h RARRAY_EMBED_LEN_MASK = (RUBY_FL_USER4|RUBY_FL_USER3),