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diff --git a/vendor/symfony/validator/Constraints/RangeValidator.php b/vendor/symfony/validator/Constraints/RangeValidator.php
new file mode 100644
index 000000000..05ef3b47c
--- /dev/null
+++ b/vendor/symfony/validator/Constraints/RangeValidator.php
@@ -0,0 +1,104 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Validator\Constraints;
+
+use Symfony\Component\Validator\Context\ExecutionContextInterface;
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\ConstraintValidator;
+use Symfony\Component\Validator\Exception\UnexpectedTypeException;
+
+/**
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ */
+class RangeValidator extends ConstraintValidator
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function validate($value, Constraint $constraint)
+    {
+        if (!$constraint instanceof Range) {
+            throw new UnexpectedTypeException($constraint, __NAMESPACE__.'\Range');
+        }
+
+        if (null === $value) {
+            return;
+        }
+
+        if (!is_numeric($value) && !$value instanceof \DateTime && !$value instanceof \DateTimeInterface) {
+            if ($this->context instanceof ExecutionContextInterface) {
+                $this->context->buildViolation($constraint->invalidMessage)
+                    ->setParameter('{{ value }}', $this->formatValue($value, self::PRETTY_DATE))
+                    ->setCode(Range::INVALID_CHARACTERS_ERROR)
+                    ->addViolation();
+            } else {
+                $this->buildViolation($constraint->invalidMessage)
+                    ->setParameter('{{ value }}', $this->formatValue($value, self::PRETTY_DATE))
+                    ->setCode(Range::INVALID_CHARACTERS_ERROR)
+                    ->addViolation();
+            }
+
+            return;
+        }
+
+        $min = $constraint->min;
+        $max = $constraint->max;
+
+        // Convert strings to DateTimes if comparing another DateTime
+        // This allows to compare with any date/time value supported by
+        // the DateTime constructor:
+        // http://php.net/manual/en/datetime.formats.php
+        if ($value instanceof \DateTime || $value instanceof \DateTimeInterface) {
+            if (is_string($min)) {
+                $min = new \DateTime($min);
+            }
+
+            if (is_string($max)) {
+                $max = new \DateTime($max);
+            }
+        }
+
+        if (null !== $constraint->max && $value > $max) {
+            if ($this->context instanceof ExecutionContextInterface) {
+                $this->context->buildViolation($constraint->maxMessage)
+                    ->setParameter('{{ value }}', $this->formatValue($value, self::PRETTY_DATE))
+                    ->setParameter('{{ limit }}', $this->formatValue($max, self::PRETTY_DATE))
+                    ->setCode(Range::TOO_HIGH_ERROR)
+                    ->addViolation();
+            } else {
+                $this->buildViolation($constraint->maxMessage)
+                    ->setParameter('{{ value }}', $this->formatValue($value, self::PRETTY_DATE))
+                    ->setParameter('{{ limit }}', $this->formatValue($max, self::PRETTY_DATE))
+                    ->setCode(Range::TOO_HIGH_ERROR)
+                    ->addViolation();
+            }
+
+            return;
+        }
+
+        if (null !== $constraint->min && $value < $min) {
+            if ($this->context instanceof ExecutionContextInterface) {
+                $this->context->buildViolation($constraint->minMessage)
+                    ->setParameter('{{ value }}', $this->formatValue($value, self::PRETTY_DATE))
+                    ->setParameter('{{ limit }}', $this->formatValue($min, self::PRETTY_DATE))
+                    ->setCode(Range::TOO_LOW_ERROR)
+                    ->addViolation();
+            } else {
+                $this->buildViolation($constraint->minMessage)
+                    ->setParameter('{{ value }}', $this->formatValue($value, self::PRETTY_DATE))
+                    ->setParameter('{{ limit }}', $this->formatValue($min, self::PRETTY_DATE))
+                    ->setCode(Range::TOO_LOW_ERROR)
+                    ->addViolation();
+            }
+        }
+    }
+}