String#include? does not take integers

src/string.c

@@ -1530,22 +1530,12 @@ mrb_str_hash_m(mrb_state *mrb, mrb_value self)
 static mrb_value
 mrb_str_include(mrb_state *mrb, mrb_value self)
 {
-  mrb_int i;
   mrb_value str2;
-  mrb_bool include_p;
-
-  mrb_get_args(mrb, "o", &str2);
-  if (mrb_fixnum_p(str2)) {
-    include_p = (memchr(RSTRING_PTR(self), mrb_fixnum(str2), RSTRING_LEN(self)) != NULL);
-  }
-  else {
-    str2 = mrb_str_to_str(mrb, str2);
-    i = str_index(mrb, self, str2, 0);
-
-    include_p = (i != -1);
-  }
 
-  return mrb_bool_value(include_p);
+  mrb_get_args(mrb, "S", &str2);
+  if (str_index(mrb, self, str2, 0) < 0)
+    return mrb_bool_value(FALSE);
+  return mrb_bool_value(TRUE);
 }
 
 /* 15.2.10.5.22 */

test/t/string.rb

@@ -381,8 +381,6 @@ assert('String#hash', '15.2.10.5.20') do
 end
 
 assert('String#include?', '15.2.10.5.21') do
-  assert_true 'abc'.include?(97)
-  assert_false 'abc'.include?(100)
   assert_true 'abc'.include?('a')
   assert_false 'abc'.include?('d')
 end