Post to Twitter field fails to save with Status set to FALSE

To reproduce this issue ...

• have no Twitter accounts set up (I don't know if this is essential)
• add a Post to Twitter field to a Drupal content type
• in the default settings for the field, untick the Post to Twitter status
• edit a node of that type
• there is an error when saving the field

PDOException: SQLSTATE[HY000]: General error: 1366 Incorrect integer value: '' for column 'field_post_to_twitter_status' at row 1:
INSERT INTO {field_data_field_post_to_twitter}
(entity_type, entity_id, revision_id, bundle, delta, language, field_post_to_twitter_status, field_post_to_twitter_message, field_post_to_twitter_account)
VALUES
(:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, :db_insert_placeholder_4, :db_insert_placeholder_5, :db_insert_placeholder_6, :db_insert_placeholder_7, :db_insert_placeholder_8);
Array (
[:db_insert_placeholder_0] => node
[:db_insert_placeholder_1] => 1263
[:db_insert_placeholder_2] => 1263
[:db_insert_placeholder_3] => activity
[:db_insert_placeholder_4] => 0
[:db_insert_placeholder_5] => und
[:db_insert_placeholder_6] =>
[:db_insert_placeholder_7] => New activity: [node:title] [node:url:absolute]
[:db_insert_placeholder_8] => 0 )
in field_sql_storage_field_storage_write()
(line 514 of /var/www/drupal/modules/field/modules/field_sql_storage/field_sql_storage.module).

The function twitter_post_field_widget_form() currently sets the 'status' value to FALSE. The function field_sql_storage_field_storage_write() expects this value to be an integer, but the FALSE is converted to an empty string.

Setting the default for 'status' to zero fixes this issue.

I will attach a patch.