ary_make_partial  859 array.c            return ary_make_partial(ary, rb_obj_class(ary), 0, RARRAY_LEN(ary));
ary_make_partial  888 array.c            return ary_make_partial(ary, rb_cArray, offset, n);
ary_make_partial 1226 array.c            return ary_make_partial(ary, klass, beg, len);