Minor fixes

Author: Anton Shabouta

README.md

@@ -37,8 +37,6 @@ $buffer
 
 ```
 
-More examples can be found in [`examples`](examples) directory.
-
 ## Change log
 
 Please see [CHANGELOG](CHANGELOG.md) for more information on what has changed recently.

src/Binary.php

@@ -42,7 +42,7 @@ public function __construct(string $buffer = '')
         $this->data = $buffer;
         $this->size = \strlen($this->data);
 
-        if (self::$native64BitPack === null) {
+        if (!isset(self::$native64BitPack)) {
             self::$native64BitPack = PHP_INT_SIZE === 8;
             self::$isLittleEndian  = \unpack("S", "\x01\x00")[1] === 1;
         }