Escaped Mutant for Mutator "CastString": --- Original +++ New @@ @@ public function withRemoved(int $pos) : BreadcrumbInterface { if (!array_key_exists($pos, $this->items)) { - throw new OutOfBoundsException((string) message('Pos `%pos%` not found', pos: (string) $pos)); + throw new OutOfBoundsException((string) message('Pos `%pos%` not found', pos: $pos)); } $new = clone $this; unset($new->items[$pos]);