Require phpstan and correct issues found up to level 2

* issues found by phpstan L0
* issues found by phpstan L1
* issues found by phpstan L2 in src/
* issues found by phpstan L2 in tests/

src/BinaryUtils.php

@@ -10,7 +10,7 @@ class BinaryUtils
     /**
      * Applies the RFC 4122 variant field to the `clock_seq_hi_and_reserved` field
      *
-     * @param $clockSeqHi
+     * @param int $clockSeqHi
      * @return int The high field of the clock sequence multiplexed with the variant
      * @link http://tools.ietf.org/html/rfc4122#section-4.1.1
      */

src/Converter/Time/PhpTimeConverter.php

@@ -36,7 +36,7 @@ class PhpTimeConverter implements TimeConverterInterface
     {
         // 0x01b21dd213814000 is the number of 100-ns intervals between the
         // UUID epoch 1582-10-15 00:00:00 and the Unix epoch 1970-01-01 00:00:00.
-        $uuidTime = ($seconds * 10000000) + ($microSeconds * 10) + 0x01b21dd213814000;
+        $uuidTime = ((int) $seconds * 10000000) + ((int) $microSeconds * 10) + 0x01b21dd213814000;
 
         return [
             'low' => sprintf('%08x', $uuidTime & 0xffffffff),

src/FeatureSet.php

@@ -283,7 +283,7 @@ class FeatureSet
      * Determines which time converter to use and returns the configured
      * time converter for this environment
      *
-     * @return TimeConverterInterface
+     * @return \Ramsey\Uuid\Converter\TimeConverterInterface
      */
     protected function buildTimeConverter()
     {

src/Provider/Time/FixedTimeProvider.php

@@ -33,7 +33,7 @@ class FixedTimeProvider implements TimeProviderInterface
     /**
      * Constructs a `FixedTimeProvider` using the provided `$timestamp`
      *
-     * @param int[] Array containing `sec` and `usec` components of a timestamp
+     * @param int[] $timestamp Array containing `sec` and `usec` components of a timestamp
      * @throws InvalidArgumentException if the `$timestamp` does not contain `sec` or `usec` components
      */
     public function __construct(array $timestamp)

src/Uuid.php

@@ -238,6 +238,7 @@ class Uuid implements UuidInterface
      */
     public function unserialize($serialized)
     {
+        /** @var \Ramsey\Uuid\Uuid $uuid */
         $uuid = self::fromString($serialized);
         $this->codec = $uuid->codec;
         $this->converter = $uuid->converter;