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    <h3>Editing: EnumeratesValues.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php

namespace Illuminate\Support\Traits;

use CachingIterator;
use Closure;
use Exception;
use Illuminate\Contracts\Support\Arrayable;
use Illuminate\Contracts\Support\Jsonable;
use Illuminate\Support\Arr;
use Illuminate\Support\Collection;
use Illuminate\Support\Enumerable;
use Illuminate\Support\HigherOrderCollectionProxy;
use Illuminate\Support\HigherOrderWhenProxy;
use JsonSerializable;
use Symfony\Component\VarDumper\VarDumper;
use Traversable;
use UnexpectedValueException;
use UnitEnum;

/**
 * @property-read HigherOrderCollectionProxy $average
 * @property-read HigherOrderCollectionProxy $avg
 * @property-read HigherOrderCollectionProxy $contains
 * @property-read HigherOrderCollectionProxy $doesntContain
 * @property-read HigherOrderCollectionProxy $each
 * @property-read HigherOrderCollectionProxy $every
 * @property-read HigherOrderCollectionProxy $filter
 * @property-read HigherOrderCollectionProxy $first
 * @property-read HigherOrderCollectionProxy $flatMap
 * @property-read HigherOrderCollectionProxy $groupBy
 * @property-read HigherOrderCollectionProxy $keyBy
 * @property-read HigherOrderCollectionProxy $map
 * @property-read HigherOrderCollectionProxy $max
 * @property-read HigherOrderCollectionProxy $min
 * @property-read HigherOrderCollectionProxy $partition
 * @property-read HigherOrderCollectionProxy $reject
 * @property-read HigherOrderCollectionProxy $some
 * @property-read HigherOrderCollectionProxy $sortBy
 * @property-read HigherOrderCollectionProxy $sortByDesc
 * @property-read HigherOrderCollectionProxy $skipUntil
 * @property-read HigherOrderCollectionProxy $skipWhile
 * @property-read HigherOrderCollectionProxy $sum
 * @property-read HigherOrderCollectionProxy $takeUntil
 * @property-read HigherOrderCollectionProxy $takeWhile
 * @property-read HigherOrderCollectionProxy $unique
 * @property-read HigherOrderCollectionProxy $until
 */
trait EnumeratesValues
{
    /**
     * Indicates that the object's string representation should be escaped when __toString is invoked.
     *
     * @var bool
     */
    protected $escapeWhenCastingToString = false;

    /**
     * The methods that can be proxied.
     *
     * @var string[]
     */
    protected static $proxies = [
        'average',
        'avg',
        'contains',
        'doesntContain',
        'each',
        'every',
        'filter',
        'first',
        'flatMap',
        'groupBy',
        'keyBy',
        'map',
        'max',
        'min',
        'partition',
        'reject',
        'skipUntil',
        'skipWhile',
        'some',
        'sortBy',
        'sortByDesc',
        'sum',
        'takeUntil',
        'takeWhile',
        'unique',
        'until',
    ];

    /**
     * Create a new collection instance if the value isn't one already.
     *
     * @param  mixed  $items
     * @return static
     */
    public static function make($items = [])
    {
        return new static($items);
    }

    /**
     * Wrap the given value in a collection if applicable.
     *
     * @param  mixed  $value
     * @return static
     */
    public static function wrap($value)
    {
        return $value instanceof Enumerable
            ? new static($value)
            : new static(Arr::wrap($value));
    }

    /**
     * Get the underlying items from the given collection if applicable.
     *
     * @param  array|static  $value
     * @return array
     */
    public static function unwrap($value)
    {
        return $value instanceof Enumerable ? $value-&gt;all() : $value;
    }

    /**
     * Create a new instance with no items.
     *
     * @return static
     */
    public static function empty()
    {
        return new static([]);
    }

    /**
     * Create a new collection by invoking the callback a given amount of times.
     *
     * @param  int  $number
     * @param  callable|null  $callback
     * @return static
     */
    public static function times($number, callable $callback = null)
    {
        if ($number &lt; 1) {
            return new static;
        }

        return static::range(1, $number)
            -&gt;when($callback)
            -&gt;map($callback);
    }

    /**
     * Alias for the &quot;avg&quot; method.
     *
     * @param  callable|string|null  $callback
     * @return mixed
     */
    public function average($callback = null)
    {
        return $this-&gt;avg($callback);
    }

    /**
     * Alias for the &quot;contains&quot; method.
     *
     * @param  mixed  $key
     * @param  mixed  $operator
     * @param  mixed  $value
     * @return bool
     */
    public function some($key, $operator = null, $value = null)
    {
        return $this-&gt;contains(...func_get_args());
    }

    /**
     * Determine if an item exists, using strict comparison.
     *
     * @param  mixed  $key
     * @param  mixed  $value
     * @return bool
     */
    public function containsStrict($key, $value = null)
    {
        if (func_num_args() === 2) {
            return $this-&gt;contains(function ($item) use ($key, $value) {
                return data_get($item, $key) === $value;
            });
        }

        if ($this-&gt;useAsCallable($key)) {
            return ! is_null($this-&gt;first($key));
        }

        foreach ($this as $item) {
            if ($item === $key) {
                return true;
            }
        }

        return false;
    }

    /**
     * Dump the items and end the script.
     *
     * @param  mixed  ...$args
     * @return void
     */
    public function dd(...$args)
    {
        $this-&gt;dump(...$args);

        exit(1);
    }

    /**
     * Dump the items.
     *
     * @return $this
     */
    public function dump()
    {
        (new Collection(func_get_args()))
            -&gt;push($this-&gt;all())
            -&gt;each(function ($item) {
                VarDumper::dump($item);
            });

        return $this;
    }

    /**
     * Execute a callback over each item.
     *
     * @param  callable  $callback
     * @return $this
     */
    public function each(callable $callback)
    {
        foreach ($this as $key =&gt; $item) {
            if ($callback($item, $key) === false) {
                break;
            }
        }

        return $this;
    }

    /**
     * Execute a callback over each nested chunk of items.
     *
     * @param  callable  $callback
     * @return static
     */
    public function eachSpread(callable $callback)
    {
        return $this-&gt;each(function ($chunk, $key) use ($callback) {
            $chunk[] = $key;

            return $callback(...$chunk);
        });
    }

    /**
     * Determine if all items pass the given truth test.
     *
     * @param  string|callable  $key
     * @param  mixed  $operator
     * @param  mixed  $value
     * @return bool
     */
    public function every($key, $operator = null, $value = null)
    {
        if (func_num_args() === 1) {
            $callback = $this-&gt;valueRetriever($key);

            foreach ($this as $k =&gt; $v) {
                if (! $callback($v, $k)) {
                    return false;
                }
            }

            return true;
        }

        return $this-&gt;every($this-&gt;operatorForWhere(...func_get_args()));
    }

    /**
     * Get the first item by the given key value pair.
     *
     * @param  string  $key
     * @param  mixed  $operator
     * @param  mixed  $value
     * @return mixed
     */
    public function firstWhere($key, $operator = null, $value = null)
    {
        return $this-&gt;first($this-&gt;operatorForWhere(...func_get_args()));
    }

    /**
     * Determine if the collection is not empty.
     *
     * @return bool
     */
    public function isNotEmpty()
    {
        return ! $this-&gt;isEmpty();
    }

    /**
     * Run a map over each nested chunk of items.
     *
     * @param  callable  $callback
     * @return static
     */
    public function mapSpread(callable $callback)
    {
        return $this-&gt;map(function ($chunk, $key) use ($callback) {
            $chunk[] = $key;

            return $callback(...$chunk);
        });
    }

    /**
     * Run a grouping map over the items.
     *
     * The callback should return an associative array with a single key/value pair.
     *
     * @param  callable  $callback
     * @return static
     */
    public function mapToGroups(callable $callback)
    {
        $groups = $this-&gt;mapToDictionary($callback);

        return $groups-&gt;map([$this, 'make']);
    }

    /**
     * Map a collection and flatten the result by a single level.
     *
     * @param  callable  $callback
     * @return static
     */
    public function flatMap(callable $callback)
    {
        return $this-&gt;map($callback)-&gt;collapse();
    }

    /**
     * Map the values into a new class.
     *
     * @param  string  $class
     * @return static
     */
    public function mapInto($class)
    {
        return $this-&gt;map(function ($value, $key) use ($class) {
            return new $class($value, $key);
        });
    }

    /**
     * Get the min value of a given key.
     *
     * @param  callable|string|null  $callback
     * @return mixed
     */
    public function min($callback = null)
    {
        $callback = $this-&gt;valueRetriever($callback);

        return $this-&gt;map(function ($value) use ($callback) {
            return $callback($value);
        })-&gt;filter(function ($value) {
            return ! is_null($value);
        })-&gt;reduce(function ($result, $value) {
            return is_null($result) || $value &lt; $result ? $value : $result;
        });
    }

    /**
     * Get the max value of a given key.
     *
     * @param  callable|string|null  $callback
     * @return mixed
     */
    public function max($callback = null)
    {
        $callback = $this-&gt;valueRetriever($callback);

        return $this-&gt;filter(function ($value) {
            return ! is_null($value);
        })-&gt;reduce(function ($result, $item) use ($callback) {
            $value = $callback($item);

            return is_null($result) || $value &gt; $result ? $value : $result;
        });
    }

    /**
     * &quot;Paginate&quot; the collection by slicing it into a smaller collection.
     *
     * @param  int  $page
     * @param  int  $perPage
     * @return static
     */
    public function forPage($page, $perPage)
    {
        $offset = max(0, ($page - 1) * $perPage);

        return $this-&gt;slice($offset, $perPage);
    }

    /**
     * Partition the collection into two arrays using the given callback or key.
     *
     * @param  callable|string  $key
     * @param  mixed  $operator
     * @param  mixed  $value
     * @return static
     */
    public function partition($key, $operator = null, $value = null)
    {
        $passed = [];
        $failed = [];

        $callback = func_num_args() === 1
                ? $this-&gt;valueRetriever($key)
                : $this-&gt;operatorForWhere(...func_get_args());

        foreach ($this as $key =&gt; $item) {
            if ($callback($item, $key)) {
                $passed[$key] = $item;
            } else {
                $failed[$key] = $item;
            }
        }

        return new static([new static($passed), new static($failed)]);
    }

    /**
     * Get the sum of the given values.
     *
     * @param  callable|string|null  $callback
     * @return mixed
     */
    public function sum($callback = null)
    {
        $callback = is_null($callback)
            ? $this-&gt;identity()
            : $this-&gt;valueRetriever($callback);

        return $this-&gt;reduce(function ($result, $item) use ($callback) {
            return $result + $callback($item);
        }, 0);
    }

    /**
     * Apply the callback if the value is truthy.
     *
     * @param  bool|mixed  $value
     * @param  callable|null  $callback
     * @param  callable|null  $default
     * @return static|mixed
     */
    public function when($value, callable $callback = null, callable $default = null)
    {
        if (! $callback) {
            return new HigherOrderWhenProxy($this, $value);
        }

        if ($value) {
            return $callback($this, $value);
        } elseif ($default) {
            return $default($this, $value);
        }

        return $this;
    }

    /**
     * Apply the callback if the collection is empty.
     *
     * @param  callable  $callback
     * @param  callable|null  $default
     * @return static|mixed
     */
    public function whenEmpty(callable $callback, callable $default = null)
    {
        return $this-&gt;when($this-&gt;isEmpty(), $callback, $default);
    }

    /**
     * Apply the callback if the collection is not empty.
     *
     * @param  callable  $callback
     * @param  callable|null  $default
     * @return static|mixed
     */
    public function whenNotEmpty(callable $callback, callable $default = null)
    {
        return $this-&gt;when($this-&gt;isNotEmpty(), $callback, $default);
    }

    /**
     * Apply the callback if the value is falsy.
     *
     * @param  bool  $value
     * @param  callable  $callback
     * @param  callable|null  $default
     * @return static|mixed
     */
    public function unless($value, callable $callback, callable $default = null)
    {
        return $this-&gt;when(! $value, $callback, $default);
    }

    /**
     * Apply the callback unless the collection is empty.
     *
     * @param  callable  $callback
     * @param  callable|null  $default
     * @return static|mixed
     */
    public function unlessEmpty(callable $callback, callable $default = null)
    {
        return $this-&gt;whenNotEmpty($callback, $default);
    }

    /**
     * Apply the callback unless the collection is not empty.
     *
     * @param  callable  $callback
     * @param  callable|null  $default
     * @return static|mixed
     */
    public function unlessNotEmpty(callable $callback, callable $default = null)
    {
        return $this-&gt;whenEmpty($callback, $default);
    }

    /**
     * Filter items by the given key value pair.
     *
     * @param  string  $key
     * @param  mixed  $operator
     * @param  mixed  $value
     * @return static
     */
    public function where($key, $operator = null, $value = null)
    {
        return $this-&gt;filter($this-&gt;operatorForWhere(...func_get_args()));
    }

    /**
     * Filter items where the value for the given key is null.
     *
     * @param  string|null  $key
     * @return static
     */
    public function whereNull($key = null)
    {
        return $this-&gt;whereStrict($key, null);
    }

    /**
     * Filter items where the value for the given key is not null.
     *
     * @param  string|null  $key
     * @return static
     */
    public function whereNotNull($key = null)
    {
        return $this-&gt;where($key, '!==', null);
    }

    /**
     * Filter items by the given key value pair using strict comparison.
     *
     * @param  string  $key
     * @param  mixed  $value
     * @return static
     */
    public function whereStrict($key, $value)
    {
        return $this-&gt;where($key, '===', $value);
    }

    /**
     * Filter items by the given key value pair.
     *
     * @param  string  $key
     * @param  mixed  $values
     * @param  bool  $strict
     * @return static
     */
    public function whereIn($key, $values, $strict = false)
    {
        $values = $this-&gt;getArrayableItems($values);

        return $this-&gt;filter(function ($item) use ($key, $values, $strict) {
            return in_array(data_get($item, $key), $values, $strict);
        });
    }

    /**
     * Filter items by the given key value pair using strict comparison.
     *
     * @param  string  $key
     * @param  mixed  $values
     * @return static
     */
    public function whereInStrict($key, $values)
    {
        return $this-&gt;whereIn($key, $values, true);
    }

    /**
     * Filter items such that the value of the given key is between the given values.
     *
     * @param  string  $key
     * @param  array  $values
     * @return static
     */
    public function whereBetween($key, $values)
    {
        return $this-&gt;where($key, '&gt;=', reset($values))-&gt;where($key, '&lt;=', end($values));
    }

    /**
     * Filter items such that the value of the given key is not between the given values.
     *
     * @param  string  $key
     * @param  array  $values
     * @return static
     */
    public function whereNotBetween($key, $values)
    {
        return $this-&gt;filter(function ($item) use ($key, $values) {
            return data_get($item, $key) &lt; reset($values) || data_get($item, $key) &gt; end($values);
        });
    }

    /**
     * Filter items by the given key value pair.
     *
     * @param  string  $key
     * @param  mixed  $values
     * @param  bool  $strict
     * @return static
     */
    public function whereNotIn($key, $values, $strict = false)
    {
        $values = $this-&gt;getArrayableItems($values);

        return $this-&gt;reject(function ($item) use ($key, $values, $strict) {
            return in_array(data_get($item, $key), $values, $strict);
        });
    }

    /**
     * Filter items by the given key value pair using strict comparison.
     *
     * @param  string  $key
     * @param  mixed  $values
     * @return static
     */
    public function whereNotInStrict($key, $values)
    {
        return $this-&gt;whereNotIn($key, $values, true);
    }

    /**
     * Filter the items, removing any items that don't match the given type(s).
     *
     * @param  string|string[]  $type
     * @return static
     */
    public function whereInstanceOf($type)
    {
        return $this-&gt;filter(function ($value) use ($type) {
            if (is_array($type)) {
                foreach ($type as $classType) {
                    if ($value instanceof $classType) {
                        return true;
                    }
                }

                return false;
            }

            return $value instanceof $type;
        });
    }

    /**
     * Pass the collection to the given callback and return the result.
     *
     * @param  callable  $callback
     * @return mixed
     */
    public function pipe(callable $callback)
    {
        return $callback($this);
    }

    /**
     * Pass the collection into a new class.
     *
     * @param  string  $class
     * @return mixed
     */
    public function pipeInto($class)
    {
        return new $class($this);
    }

    /**
     * Pass the collection through a series of callable pipes and return the result.
     *
     * @param  array&lt;callable&gt;  $pipes
     * @return mixed
     */
    public function pipeThrough($pipes)
    {
        return static::make($pipes)-&gt;reduce(
            function ($carry, $pipe) {
                return $pipe($carry);
            },
            $this,
        );
    }

    /**
     * Pass the collection to the given callback and then return it.
     *
     * @param  callable  $callback
     * @return $this
     */
    public function tap(callable $callback)
    {
        $callback(clone $this);

        return $this;
    }

    /**
     * Reduce the collection to a single value.
     *
     * @param  callable  $callback
     * @param  mixed  $initial
     * @return mixed
     */
    public function reduce(callable $callback, $initial = null)
    {
        $result = $initial;

        foreach ($this as $key =&gt; $value) {
            $result = $callback($result, $value, $key);
        }

        return $result;
    }

    /**
     * Reduce the collection to multiple aggregate values.
     *
     * @param  callable  $callback
     * @param  mixed  ...$initial
     * @return array
     *
     * @deprecated Use &quot;reduceSpread&quot; instead
     *
     * @throws \UnexpectedValueException
     */
    public function reduceMany(callable $callback, ...$initial)
    {
        return $this-&gt;reduceSpread($callback, ...$initial);
    }

    /**
     * Reduce the collection to multiple aggregate values.
     *
     * @param  callable  $callback
     * @param  mixed  ...$initial
     * @return array
     *
     * @throws \UnexpectedValueException
     */
    public function reduceSpread(callable $callback, ...$initial)
    {
        $result = $initial;

        foreach ($this as $key =&gt; $value) {
            $result = call_user_func_array($callback, array_merge($result, [$value, $key]));

            if (! is_array($result)) {
                throw new UnexpectedValueException(sprintf(
                    &quot;%s::reduceMany expects reducer to return an array, but got a '%s' instead.&quot;,
                    class_basename(static::class), gettype($result)
                ));
            }
        }

        return $result;
    }

    /**
     * Reduce an associative collection to a single value.
     *
     * @param  callable  $callback
     * @param  mixed  $initial
     * @return mixed
     */
    public function reduceWithKeys(callable $callback, $initial = null)
    {
        return $this-&gt;reduce($callback, $initial);
    }

    /**
     * Create a collection of all elements that do not pass a given truth test.
     *
     * @param  callable|mixed  $callback
     * @return static
     */
    public function reject($callback = true)
    {
        $useAsCallable = $this-&gt;useAsCallable($callback);

        return $this-&gt;filter(function ($value, $key) use ($callback, $useAsCallable) {
            return $useAsCallable
                ? ! $callback($value, $key)
                : $value != $callback;
        });
    }

    /**
     * Return only unique items from the collection array using strict comparison.
     *
     * @param  string|callable|null  $key
     * @return static
     */
    public function uniqueStrict($key = null)
    {
        return $this-&gt;unique($key, true);
    }

    /**
     * Collect the values into a collection.
     *
     * @return \Illuminate\Support\Collection
     */
    public function collect()
    {
        return new Collection($this-&gt;all());
    }

    /**
     * Get the collection of items as a plain array.
     *
     * @return array
     */
    public function toArray()
    {
        return $this-&gt;map(function ($value) {
            return $value instanceof Arrayable ? $value-&gt;toArray() : $value;
        })-&gt;all();
    }

    /**
     * Convert the object into something JSON serializable.
     *
     * @return array
     */
    #[\ReturnTypeWillChange]
    public function jsonSerialize()
    {
        return array_map(function ($value) {
            if ($value instanceof JsonSerializable) {
                return $value-&gt;jsonSerialize();
            } elseif ($value instanceof Jsonable) {
                return json_decode($value-&gt;toJson(), true);
            } elseif ($value instanceof Arrayable) {
                return $value-&gt;toArray();
            }

            return $value;
        }, $this-&gt;all());
    }

    /**
     * Get the collection of items as JSON.
     *
     * @param  int  $options
     * @return string
     */
    public function toJson($options = 0)
    {
        return json_encode($this-&gt;jsonSerialize(), $options);
    }

    /**
     * Get a CachingIterator instance.
     *
     * @param  int  $flags
     * @return \CachingIterator
     */
    public function getCachingIterator($flags = CachingIterator::CALL_TOSTRING)
    {
        return new CachingIterator($this-&gt;getIterator(), $flags);
    }

    /**
     * Convert the collection to its string representation.
     *
     * @return string
     */
    public function __toString()
    {
        return $this-&gt;escapeWhenCastingToString
                    ? e($this-&gt;toJson())
                    : $this-&gt;toJson();
    }

    /**
     * Indicate that the model's string representation should be escaped when __toString is invoked.
     *
     * @param  bool  $escape
     * @return $this
     */
    public function escapeWhenCastingToString($escape = true)
    {
        $this-&gt;escapeWhenCastingToString = $escape;

        return $this;
    }

    /**
     * Add a method to the list of proxied methods.
     *
     * @param  string  $method
     * @return void
     */
    public static function proxy($method)
    {
        static::$proxies[] = $method;
    }

    /**
     * Dynamically access collection proxies.
     *
     * @param  string  $key
     * @return mixed
     *
     * @throws \Exception
     */
    public function __get($key)
    {
        if (! in_array($key, static::$proxies)) {
            throw new Exception(&quot;Property [{$key}] does not exist on this collection instance.&quot;);
        }

        return new HigherOrderCollectionProxy($this, $key);
    }

    /**
     * Results array of items from Collection or Arrayable.
     *
     * @param  mixed  $items
     * @return array
     */
    protected function getArrayableItems($items)
    {
        if (is_array($items)) {
            return $items;
        } elseif ($items instanceof Enumerable) {
            return $items-&gt;all();
        } elseif ($items instanceof Arrayable) {
            return $items-&gt;toArray();
        } elseif ($items instanceof Jsonable) {
            return json_decode($items-&gt;toJson(), true);
        } elseif ($items instanceof JsonSerializable) {
            return (array) $items-&gt;jsonSerialize();
        } elseif ($items instanceof Traversable) {
            return iterator_to_array($items);
        } elseif ($items instanceof UnitEnum) {
            return [$items];
        }

        return (array) $items;
    }

    /**
     * Get an operator checker callback.
     *
     * @param  string  $key
     * @param  string|null  $operator
     * @param  mixed  $value
     * @return \Closure
     */
    protected function operatorForWhere($key, $operator = null, $value = null)
    {
        if (func_num_args() === 1) {
            $value = true;

            $operator = '=';
        }

        if (func_num_args() === 2) {
            $value = $operator;

            $operator = '=';
        }

        return function ($item) use ($key, $operator, $value) {
            $retrieved = data_get($item, $key);

            $strings = array_filter([$retrieved, $value], function ($value) {
                return is_string($value) || (is_object($value) &amp;&amp; method_exists($value, '__toString'));
            });

            if (count($strings) &lt; 2 &amp;&amp; count(array_filter([$retrieved, $value], 'is_object')) == 1) {
                return in_array($operator, ['!=', '&lt;&gt;', '!==']);
            }

            switch ($operator) {
                default:
                case '=':
                case '==':  return $retrieved == $value;
                case '!=':
                case '&lt;&gt;':  return $retrieved != $value;
                case '&lt;':   return $retrieved &lt; $value;
                case '&gt;':   return $retrieved &gt; $value;
                case '&lt;=':  return $retrieved &lt;= $value;
                case '&gt;=':  return $retrieved &gt;= $value;
                case '===': return $retrieved === $value;
                case '!==': return $retrieved !== $value;
            }
        };
    }

    /**
     * Determine if the given value is callable, but not a string.
     *
     * @param  mixed  $value
     * @return bool
     */
    protected function useAsCallable($value)
    {
        return ! is_string($value) &amp;&amp; is_callable($value);
    }

    /**
     * Get a value retrieving callback.
     *
     * @param  callable|string|null  $value
     * @return callable
     */
    protected function valueRetriever($value)
    {
        if ($this-&gt;useAsCallable($value)) {
            return $value;
        }

        return function ($item) use ($value) {
            return data_get($item, $value);
        };
    }

    /**
     * Make a function to check an item's equality.
     *
     * @param  mixed  $value
     * @return \Closure
     */
    protected function equality($value)
    {
        return function ($item) use ($value) {
            return $item === $value;
        };
    }

    /**
     * Make a function using another function, by negating its result.
     *
     * @param  \Closure  $callback
     * @return \Closure
     */
    protected function negate(Closure $callback)
    {
        return function (...$params) use ($callback) {
            return ! $callback(...$params);
        };
    }

    /**
     * Make a function that returns what's passed to it.
     *
     * @return \Closure
     */
    protected function identity()
    {
        return function ($value) {
            return $value;
        };
    }
}
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