PDOException when calling locale_add_language() with $enabled = FALSE

Problem/Motivation

The documentation of the locale_add_language() function in locale.inc explicitly says:

Optionally TRUE to enable the language when created or FALSE to disable

However calling the function with FALSE as the value of the $enabled parameter results in the following error:

PDOException: SQLSTATE[HY000]: General error: 1366 Incorrect integer value: '' for column 'enabled' at row 1: INSERT INTO {languages} (language, name, native, direction, domain, prefix, enabled) 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); Array ( [:db_insert_placeholder_0] => pt-pt [:db_insert_placeholder_1] => Portuguese [:db_insert_placeholder_2] => Português [:db_insert_placeholder_3] => 0 [:db_insert_placeholder_4] => [:db_insert_placeholder_5] => pt-pt [:db_insert_placeholder_6] => ) in locale_add_language() (line 584 of /var/www/example/htdocs/includes/locale.inc).

Using integer 0 as the value for $enabled does work without errors. The "enabled" column in the schema is type integer.

Steps to reproduce:

Create a function calling locale_add_language() with FALSE as the value for the $enabled parameter. For example in an implementation of hook_update_N():

function example_update_7100() {
  locale_add_language('pt-pt', NULL, 'NULL, LANGUAGE_LTR, '', '', FALSE, FALSE);
}

Proposed resolution

Since we probably do not want an API change, we can cast the value of $enabled to an integer when writing the value to the database:

  db_insert('languages')
    ->fields(array(
      'language' => $langcode,
      'name' => $name,
      'native' => $native,
      'direction' => $direction,
      'domain' => $domain,
      'prefix' => $prefix,
      'enabled' => (int) $enabled,
    ))
    ->execute();

Remaining tasks

Review needed

User interface changes

None

API changes

None

Data model changes

None