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--- rfc:callable-interfaces [2016/04/06 11:58] – Adding question about instanceof usage ocramius
+++ rfc:callable-interfaces [2016/04/06 12:00] – ocramius
@@ Line 112: / Line 112: @@
 ===== Still Open for Discussion =====
- * how will **instanceof** behave, when asked for a type-check against **callable**?
+How will **instanceof** behave, when asked for a type-check against **callable**?
+<code php>
+interface RegisterUser {
+    public function __invoke(Username $username) : UserRegistration;
+}
+interface DeleteUserRegistration {
+    public function __invoke(Username $username) : UserRegistration;
+}
+$register = function (Username $username) : UserRegistration {
+    return new UserRegistration(...);
+};
+var_dump($register instanceof DeleteUserRegistration); // true? false? possibly want to keep current semantics here.
+</code>
 ===== Backward Incompatible Changes =====