Use stricter type checks in Intl's bound methods

test/intl/regress-4870.js

Index: test/intl/regress-4870.js
diff --git a/test/intl/regexp-prepare.js b/test/intl/regress-4870.js
similarity index 51%
copy from test/intl/regexp-prepare.js
copy to test/intl/regress-4870.js
index dec84110ed02e30bba674538534a069f7d43d39d..72c095eccd8f6b27384fa0f4f7937e56a668063b 100644
--- a/test/intl/regexp-prepare.js
+++ b/test/intl/regress-4870.js
@@ -2,4 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-/(\w)(\w)(\w)(\w)(\w)(\w)(\w)(\w)(\w)(\w)/.exec(">>>abcdefghij<<<");
+assertThrows(() =>
+    Object.getOwnPropertyDescriptor(Intl.Collator.prototype, 'compare')
+      .get.call(new Intl.DateTimeFormat())('a', 'b'),
+    TypeError);