strictness: enum checks if all values called parent constructor

phpstan.neon

@@ -2,3 +2,12 @@ includes:
 	- vendor/phpstan/phpstan-strict-rules/rules.neon
 	- vendor/grifart/phpstan-oneline/config.neon
 
+parameters:
+	ignoreErrors:
+
+# 		for phpstan 0.11
+#		-
+#			message: '#Strict comparison using === between int\\|string and null will always evaluate to false#'
+#			path: src/Internal/Meta.php
+
+		- '#Strict comparison using === between int\\|string and null will always evaluate to false#'
\ No newline at end of file

src/Internal/Meta.php

@@ -51,6 +51,13 @@ final class Meta
 
 		foreach($values as $value) {
 			$scalar = $value->toScalar();
+
+			if ($scalar === NULL) {
+				throw new UsageException(
+					"Parent constructor has not been called while constructing one of {$this->getClass()} enum values."
+				);
+			}
+
 			if (isset($scalarToValues[$scalar])) {
 				throw new UsageException('You have provided duplicated scalar values.');
 			}

tests/Regression/forgotten-constructor-call.phpt

+<?php declare(strict_types=1);
+
+
+use Grifart\Enum\UsageException;
+use Tester\Assert;
+
+require __DIR__ . '/../bootstrap.php';
+
+/**
+ * @method static ForgottenConstructorCall VALUE1()
+ */
+abstract class ForgottenConstructorCall extends \Grifart\Enum\Enum
+{
+	private const VALUE1 = 1;
+
+	protected static function provideInstances(): array
+	{
+		return [
+			new class extends ForgottenConstructorCall {
+				/** @noinspection PhpMissingParentConstructorInspection */
+				protected function __construct() {
+					// no parent call
+				}
+			},
+		];
+	}
+}
+
+Assert::exception(
+	function() {
+		ForgottenConstructorCall::VALUE1();
+	},
+	UsageException::class,
+	'Parent constructor has not been called while constructing one of ForgottenConstructorCall enum values.'
+);