Address 64 bit issues

Author: Riimu

src/Encoder/IntegerEncoder.php

@@ -22,7 +22,7 @@ public function supports($value)
 
     public function encode($value, $depth, array $options, callable $encode)
     {
-        $string = number_format($value, 0, '.', '');
+        $string = (string) $value;
 
         if ($value === 1 << (PHP_INT_SIZE * 8 - 1)) {
             $string = sprintf('(int)%s%s', $options['whitespace'] ? ' ' : '', $string);

src/InvalidOptionException.php

@@ -3,6 +3,7 @@
 namespace Riimu\Kit\PHPEncoder;
 
 /**
+ * Exception that gets thrown if invalid encoder options are used.
  * @author Riikka Kalliomäki <[email protected]>
  * @copyright Copyright (c) 2015, Riikka Kalliomäki
  * @license http://opensource.org/licenses/mit-license.php MIT License

tests/tests/EncodingTest.php

@@ -125,11 +125,13 @@ public function testFloatIntegers()
     public function testMaximumFloatIntegers()
     {
         $encoder = new PHPEncoder(['float.integers' => true]);
+        $positive = FloatEncoder::FLOAT_MAX - 1;
+        $negative = -FloatEncoder::FLOAT_MAX + 1;
 
         $this->assertEncode(FloatEncoder::FLOAT_MAX, '9.0071992547409927E+15', $encoder);
         $this->assertEncode(-FloatEncoder::FLOAT_MAX, '-9.0071992547409927E+15', $encoder);
-        $this->assertEncode(FloatEncoder::FLOAT_MAX - 1, '9007199254740991', $encoder);
-        $this->assertEncode(-FloatEncoder::FLOAT_MAX + 1, '-9007199254740991', $encoder);
+        $this->assertEncode(number_format($positive, 0, '', '') + 0, '9007199254740991', $encoder, $positive);
+        $this->assertEncode(number_format($negative, 0, '', '') + 0, '-9007199254740991', $encoder, $negative);
     }
 
     public function testLargeFloatIntegers()