Keep raw value

Because of field type check and value rewrite, the raw value is not available.
Suggestion: save the raw value before changing the value.
Ex:

$filter_summary = array(
  'label' => check_plain($label),
  'value' => $filter->value,
  'raw_value' => $filter->value,
  'op' => $op,
  'opLabel' => $op_label,
  'field' => $name,
);