en_GB culture file doesn't include day of week in its long format date pattern

[andymstone]

The en_GB culture file doesn't include the day of the week in its long date format:

  print(LocalDate.today().toString('D', await Cultures.getCulture('en-US')));
  > Friday, September 13, 2019
  print(LocalDate.today().toString('D', await Cultures.getCulture('en-AU')));
  > Friday, 13 September 2019
  print(LocalDate.today().toString('D', await Cultures.getCulture('en-GB')));
  > 13 September 2019

en_GB.bin has dd MMMM yyyy vs dddd, MMMM d, yyyy in en-US.bin.

Just wondering if that's an oddity in the data source that the culture file is generated from, or might indicate a problem with the conversion process? Based on ICU locales I'd expect day to be include in the GB locale too (see e.g. http://www.localeplanet.com/icu/en-GB/)