Apply suggestions from code review

Co-authored-by: Juliette <663378+jrfnl@users.noreply.github.com>

Author: rodrigoprimo

WordPress/Tests/Security/NonceVerificationUnitTest.1.inc

@@ -579,7 +579,7 @@ function allow_fully_qualified_type_test_functions() {
 }
 
 function allow_fully_qualified_type_test_functions_uppercase() {
-	if ( ! \IS_NUMERIC( $_POST['foo'] ) ) { // OK.
+	if ( ! \IS_int( $_POST['foo'] ) ) { // OK.
 		return;
 	}
 
@@ -588,7 +588,7 @@ function allow_fully_qualified_type_test_functions_uppercase() {
 
 function disallow_namespaced_type_test_functions() {
     if ( ! MyNamespace\is_bool( $_POST['foo'] ) // Bad.
-        || ! MyNamespace\is_object( $_POST['foo'] ) // Bad.
+        || ! \MyNamespace\is_object( $_POST['foo'] ) // Bad.
         || ! namespace\is_string( $_POST['foo'] ) ) // Bad, but should become ok once the sniff is able to resolve relative namespaces.
     {
         return;