Bug - plural_forms? does not see '0' and '1' as plural keys.

[broekhuis00]

Problem

I18n has special cases for '0' and '1'. However, it causes the parent not be seen as a plural node. And thus CLDR category keys are incorrectly marked as missing in languages that do not need them:

https://github.com/glebm/i18n-tasks/blob/36af58c8884a8dbdaee0e02551280baaa7191c76/lib/i18n/tasks/plural_keys.rb#L55C1-L55C75

Solution

When using these special keys, they themselves should still be marked as missing if a locale does not have them. This means adding them to CLDR_CATEGORY_KEYS would not be the correct solution. The issue lies in that should still cause the parent to be seen as plural node. Therefor the best option should be to add a check to plural_suffix? for these two special cases.

If there is a better solution, feel free to comment it.

[davidwessman]

Sorry for the slow response here @broekhuis00, but I think it makes sense.
Would be glad to see a PR with a test case