diff --git a/src/Cms/Collection.php b/src/Cms/Collection.php
index 938ad3609a..b6a80514cc 100644
--- a/src/Cms/Collection.php
+++ b/src/Cms/Collection.php
@@ -150,11 +150,11 @@ public function findBy(string $attribute, $value)
 	 * with an item for each group and a collection for each group.
 	 *
 	 * @param string|Closure $field
-	 * @param bool $i Ignore upper/lowercase for group names
+	 * @param bool $caseInsensitive Ignore upper/lowercase for group names
 	 * @return \Kirby\Cms\Collection
 	 * @throws \Kirby\Exception\Exception
 	 */
-	public function group($field, bool $i = true)
+	public function group($field, bool $caseInsensitive = true)
 	{
 		if (is_string($field) === true) {
 			$groups = new Collection([], $this->parent());
@@ -167,8 +167,12 @@ public function group($field, bool $i = true)
 					throw new InvalidArgumentException('Invalid grouping value for key: ' . $key);
 				}
 
+				$value = (string)$value;
+
 				// ignore upper/lowercase for group names
-				$value = $i === true ? Str::lower($value) : (string)$value;
+				if ($caseInsensitive === true) {
+					$value = Str::lower($value);
+				}
 
 				if (isset($groups->data[$value]) === false) {
 					// create a new entry for the group if it does not exist yet
@@ -182,7 +186,7 @@ public function group($field, bool $i = true)
 			return $groups;
 		}
 
-		return parent::group($field, $i);
+		return parent::group($field, $caseInsensitive);
 	}
 
 	/**
diff --git a/src/Toolkit/Collection.php b/src/Toolkit/Collection.php
index 7f67040de2..22c2de6f49 100644
--- a/src/Toolkit/Collection.php
+++ b/src/Toolkit/Collection.php
@@ -517,21 +517,24 @@ protected function getAttributeFromObject($object, string $attribute)
 	 * Groups the elements by a given field or callback function
 	 *
 	 * @param string|Closure $field
-	 * @param bool $i
 	 * @return \Kirby\Toolkit\Collection A new collection with an element for
 	 *                                   each group and a subcollection in
 	 *                                   each group
 	 * @throws \Exception if $field is not a string nor a callback function
 	 */
-	public function group($field, bool $i = true)
+	public function group($field, bool $caseInsensitive = true)
 	{
 		// group by field name
 		if (is_string($field) === true) {
-			return $this->group(function ($item) use ($field, $i) {
+			return $this->group(function ($item) use ($field, $caseInsensitive) {
 				$value = $this->getAttribute($item, $field);
 
 				// ignore upper/lowercase for group names
-				return $i === true ? Str::lower($value) : (string)$value;
+				if ($caseInsensitive === true) {
+					$value = Str::lower($value);
+				}
+
+				return (string)$value;
 			});
 		}