Initial

system/Entity/Cast/CSVCast.php

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+<?php
+
+/**
+ * This file is part of CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <admin@codeigniter.com>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace CodeIgniter\Entity\Cast;
+
+/**
+ * Class CSVCast
+ */
+class CSVCast extends BaseCast
+{
+    /**
+     * {@inheritDoc}
+     */
+    public static function get($value, array $params = []): array
+    {
+        return explode(',', $value);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public static function set($value, array $params = []): string
+    {
+        return implode(',', $value);
+    }
+}