Exception with default_starts_date

[danielveloso09]

Hi,

Thanks for the work on this gem, it has been quite useful in different projects through the years 😅

While doing some tests found a small issue doing Recurrence.default_starts_date, which raises an exception. But if you do Recurrence_.default_starts_date everything works fine. We can also just force the starts option, and everything is fine.

Notice that you've changed default_stars_date class method a couple months ago, which raised this issue when using Recurrence or any class that extends from Recurrence_

Is there any specific reason to have the method like:

def self.default_starts_date
  @default_starts_date.call
end

Instead of directly use the constant:

def self.default_starts_date
  DEFAULT_STARTS_DATE.call
end

If you don't see any issue with the above suggestion, I would be glad to open the PR to fix it.

---

Edit:

While running the test got the intention for it 👍

So could it be something like this?

def self.default_starts_date
  @default_starts_date ||= DEFAULT_STARTS_DATE
  @default_starts_date.call
end

Also, this didn't appear on the tests cause in the test_helper.rb#setup is setting it