2.Replace mrb_intern() func with mrb_intern2() func or mrb_intern_cstr() func.

src/kernel.c

@@ -1101,5 +1101,5 @@ mrb_init_kernel(mrb_state *mrb)
   mrb_define_method(mrb, krn, "to_s",                       mrb_any_to_s,                    MRB_ARGS_NONE());    /* 15.3.1.3.46 */
 
   mrb_include_module(mrb, mrb->object_class, mrb->kernel_module);
-  mrb_alias_method(mrb, mrb->module_class, mrb_intern(mrb, "dup"), mrb_intern(mrb, "clone"));
+  mrb_alias_method(mrb, mrb->module_class, mrb_intern2(mrb, "dup", 3), mrb_intern2(mrb, "clone", 5));
 }

src/vm.c

@@ -279,7 +279,7 @@ ecall(mrb_state *mrb, int i)
 mrb_value
 mrb_funcall(mrb_state *mrb, mrb_value self, const char *name, int argc, ...)
 {
-  mrb_sym mid = mrb_intern(mrb, name);
+  mrb_sym mid = mrb_intern_cstr(mrb, name);
 
   if (argc == 0) {
     return mrb_funcall_argv(mrb, self, mid, 0, 0);