Fixed phpstan issues

Author: Dgame

Diff for: .gitignore

@@ -1,3 +1,4 @@
 .idea
 vendor
 /.phpunit.result.cache
+composer.lock

Diff for: composer.json

@@ -38,7 +38,7 @@
     "scripts": {
         "test": [
             "phpunit",
-            "phpstan analyse src --level=7"
+            "phpstan analyse src --level=8"
         ],
         "coverage": [
             "phpunit --coverage-clover=coverage"

Diff for: src/Month.php

@@ -53,8 +53,11 @@ public static function current(): self
      */
     public static function of(string $month, int $year = null): self
     {
-        $year         = $year === null ? (int) date('Y') : $year;
-        $parsed_month = date_parse($month)['month'];
+        $year   = $year === null ? (int) date('Y') : $year;
+        $parsed = date_parse($month);
+        assert($parsed !== false);
+
+        $parsed_month = $parsed['month'];
         if ($parsed_month !== false) {
             return new self($parsed_month, $year);
         }

Diff for: src/TimeUnits.php

@@ -88,7 +88,10 @@ public function __construct(TimeUnitInterface $unit)
      */
     public static function from(DateInterval $interval): self
     {
-        return new self(new Days($interval->days));
+        $days = $interval->days;
+        assert($days !== false);
+
+        return new self(new Days((float) $days));
     }
 
     /**