The current code coverage is very low, we need to add more unit tests.

ICanBoogie\CLDR\Locale::format_list should accept pattern type only. One can use a non-localized ListFormatter with list patterns, the localized version should accept types only.

The map parameter has no effect when the list of allowed locales is provided and it only includes full locale tags. This is not clear from the documentation. It this behavior desired at all?

Example configuration:

expressLocale({
  priority: ['query', 'map', 'default'],
  allowed: ['en-CA', 'fr-CA'],
  map: { en: 'en-CA', fr: 'fr-CA' },
})

With this configuration