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diff --git a/vendor/psy/psysh/src/VarDumper/Presenter.php b/vendor/psy/psysh/src/VarDumper/Presenter.php
new file mode 100644
index 000000000..400778ab2
--- /dev/null
+++ b/vendor/psy/psysh/src/VarDumper/Presenter.php
@@ -0,0 +1,137 @@
+<?php
+
+/*
+ * This file is part of Psy Shell.
+ *
+ * (c) 2012-2018 Justin Hileman
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Psy\VarDumper;
+
+use Symfony\Component\Console\Formatter\OutputFormatter;
+use Symfony\Component\VarDumper\Caster\Caster;
+use Symfony\Component\VarDumper\Cloner\Stub;
+
+/**
+ * A Presenter service.
+ */
+class Presenter
+{
+    const VERBOSE = 1;
+
+    private $cloner;
+    private $dumper;
+    private $exceptionsImportants = [
+        "\0*\0message",
+        "\0*\0code",
+        "\0*\0file",
+        "\0*\0line",
+        "\0Exception\0previous",
+    ];
+    private $styles = [
+        'num'       => 'number',
+        'const'     => 'const',
+        'str'       => 'string',
+        'cchr'      => 'default',
+        'note'      => 'class',
+        'ref'       => 'default',
+        'public'    => 'public',
+        'protected' => 'protected',
+        'private'   => 'private',
+        'meta'      => 'comment',
+        'key'       => 'comment',
+        'index'     => 'number',
+    ];
+
+    public function __construct(OutputFormatter $formatter, $forceArrayIndexes = false)
+    {
+        // Work around https://github.com/symfony/symfony/issues/23572
+        $oldLocale = setlocale(LC_NUMERIC, 0);
+        setlocale(LC_NUMERIC, 'C');
+
+        $this->dumper = new Dumper($formatter, $forceArrayIndexes);
+        $this->dumper->setStyles($this->styles);
+
+        // Now put the locale back
+        setlocale(LC_NUMERIC, $oldLocale);
+
+        $this->cloner = new Cloner();
+        $this->cloner->addCasters(['*' => function ($obj, array $a, Stub $stub, $isNested, $filter = 0) {
+            if ($filter || $isNested) {
+                if ($obj instanceof \Exception) {
+                    $a = Caster::filter($a, Caster::EXCLUDE_NOT_IMPORTANT | Caster::EXCLUDE_EMPTY, $this->exceptionsImportants);
+                } else {
+                    $a = Caster::filter($a, Caster::EXCLUDE_PROTECTED | Caster::EXCLUDE_PRIVATE);
+                }
+            }
+
+            return $a;
+        }]);
+    }
+
+    /**
+     * Register casters.
+     *
+     * @see http://symfony.com/doc/current/components/var_dumper/advanced.html#casters
+     *
+     * @param callable[] $casters A map of casters
+     */
+    public function addCasters(array $casters)
+    {
+        $this->cloner->addCasters($casters);
+    }
+
+    /**
+     * Present a reference to the value.
+     *
+     * @param mixed $value
+     *
+     * @return string
+     */
+    public function presentRef($value)
+    {
+        return $this->present($value, 0);
+    }
+
+    /**
+     * Present a full representation of the value.
+     *
+     * If $depth is 0, the value will be presented as a ref instead.
+     *
+     * @param mixed $value
+     * @param int   $depth   (default: null)
+     * @param int   $options One of Presenter constants
+     *
+     * @return string
+     */
+    public function present($value, $depth = null, $options = 0)
+    {
+        $data = $this->cloner->cloneVar($value, !($options & self::VERBOSE) ? Caster::EXCLUDE_VERBOSE : 0);
+
+        if (null !== $depth) {
+            $data = $data->withMaxDepth($depth);
+        }
+
+        // Work around https://github.com/symfony/symfony/issues/23572
+        $oldLocale = setlocale(LC_NUMERIC, 0);
+        setlocale(LC_NUMERIC, 'C');
+
+        $output = '';
+        $this->dumper->dump($data, function ($line, $depth) use (&$output) {
+            if ($depth >= 0) {
+                if ('' !== $output) {
+                    $output .= PHP_EOL;
+                }
+                $output .= str_repeat('  ', $depth) . $line;
+            }
+        });
+
+        // Now put the locale back
+        setlocale(LC_NUMERIC, $oldLocale);
+
+        return OutputFormatter::escape($output);
+    }
+}