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Name	Action
..
ArrayComparator.php	Edit
Comparator.php	Edit
ComparisonFailure.php	Edit
DOMNodeComparator.php	Edit
DateTimeComparator.php	Edit
DoubleComparator.php	Edit
ExceptionComparator.php	Edit
Factory.php	Edit
MockObjectComparator.php	Edit
NumericComparator.php	Edit
ObjectComparator.php	Edit
ResourceComparator.php	Edit
ScalarComparator.php	Edit
SplObjectStorageComparator.php	Edit
TypeComparator.php	Edit

Editing: NumericComparator.php

<?php
/*
 * This file is part of sebastian/comparator.
 *
 * (c) Sebastian Bergmann <sebastian@phpunit.de>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace SebastianBergmann\Comparator;

/**
 * Compares numerical values for equality.
 */
class NumericComparator extends ScalarComparator
{
    /**
     * Returns whether the comparator can compare two values.
     *
     * @param mixed $expected The first value to compare
     * @param mixed $actual   The second value to compare
     *
     * @return bool
     */
    public function accepts($expected, $actual)
    {
        // all numerical values, but not if one of them is a double
        // or both of them are strings
        return \is_numeric($expected) && \is_numeric($actual) &&
               !(\is_float($expected) || \is_float($actual)) &&
               !(\is_string($expected) && \is_string($actual));
    }

/**
     * Asserts that two values are equal.
     *
     * @param mixed $expected     First value to compare
     * @param mixed $actual       Second value to compare
     * @param float $delta        Allowed numerical distance between two values to consider them equal
     * @param bool  $canonicalize Arrays are sorted before comparison when set to true
     * @param bool  $ignoreCase   Case is ignored when set to true
     *
     * @throws ComparisonFailure
     */
    public function assertEquals($expected, $actual, $delta = 0.0, $canonicalize = false, $ignoreCase = false)
    {
        if (\is_infinite($actual) && \is_infinite($expected)) {
            return;
        }

if ((\is_infinite($actual) xor \is_infinite($expected)) ||
            (\is_nan($actual) or \is_nan($expected)) ||
            \abs($actual - $expected) > $delta) {
            throw new ComparisonFailure(
                $expected,
                $actual,
                '',
                '',
                false,
                \sprintf(
                    'Failed asserting that %s matches expected %s.',
                    $this->exporter->export($actual),
                    $this->exporter->export($expected)
                )
            );
        }
    }
}