ext/numo/narray/gen/tmpl/init_class.c in numo-narray-0.9.2.0 vs ext/numo/narray/gen/tmpl/init_class.c in numo-narray-0.9.2.1

@@ -12,9 +12,10 @@
     hCast = rb_hash_new();
     rb_define_const(cT, "UPCAST", hCast);
     rb_hash_aset(hCast, rb_cArray,   cT);
     <% for x in upcast %>
     <%= x %><% end %>
+    rb_obj_freeze(hCast);
 
     <% @children.each do |m| %>
     <%= m.init_def %><% end %>
     rb_define_singleton_method(cT, "[]", <%=find("cast").c_func%>, -2);