Data too long for column 'source'

The source of a declaration might end up being the title of the contribution page from which the contribution comes from. But:

• the length allowed for the title of a contribution page is 255 characters (see xml/schema/Contribute/ContributionPage.xml#L26)
• and the length allowed for the source of a Gift Aid declaration is only 32 characters (see CRM/Civigiftaid/Upgrader.php#L773).

So a contribution sent through a contribution page titled: Standard Donation Form for Donate Page, would cause an error like:

Nov 16 22:37:09  [error] $Fatal Error Details = Array
(
    [callback] => Array
        (
            [0] => CRM_Core_Error
            [1] => handle
        )

    [code] => -1
    [message] => DB Error: unknown error
    [mode] => 16
    [debug_info] => UPDATE civicrm_value_gift_aid_declaration SET
      entity_id=220799,eligible_for_gift_aid=3,address='1 Street',post_code='PS1 TA2',
      start_date=20201116223703,given_date=20201116223703,
      source='Standard Donation Form for Donate Page'
      WHERE id=17066
      [nativecode=1406 ** Data too long for column 'source' at row 1]
    [type] => DB_Error
    [user_info] => UPDATE civicrm_value_gift_aid_declaration SET
      entity_id=220799,eligible_for_gift_aid=3,address='1 Street',post_code='PS1 TA2',
      start_date=20201116223703,given_date=20201116223703,
      source='Standard Donation Form for Donate Page'
      WHERE id=17066
      [nativecode=1406 ** Data too long for column 'source' at row 1]
    [to_string] => [db_error: message="DB Error: unknown error" code=-1 mode=callback callback=CRM_Core_Error::handle prefix="" info="UPDATE civicrm_value_gift_aid_declaration SET
      entity_id=220799,eligible_for_gift_aid=3,address='1 Street',post_code='PS1 TA2',
      start_date=20201116223703,given_date=20201116223703,
      source='Standard Donation Form for Donate Page'
      WHERE id=17066
      [nativecode=1406 ** Data too long for column 'source' at row 1]"]
)