rb_ary_bsearch_index 2535 array.c        static VALUE rb_ary_bsearch_index(VALUE ary);
rb_ary_bsearch_index 2593 array.c            VALUE index_result = rb_ary_bsearch_index(ary);
rb_ary_bsearch_index 6162 array.c            rb_define_method(rb_cArray, "bsearch_index", rb_ary_bsearch_index, 0);