New option "firstWeekOfYearMinDays" for regional week numbering rules support #825
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Added new option firstWeekOfYearMinDays to support regional variations in week numbering rules. The new option makes it possible to support world-wide rule variations - when not using moment.
The change extends Pikaday's week number support which is currently limited to the ISO 8601 week numbering rule (week 1 = the first week with 4 days - considering Monday as the first day of the week).
https://en.wikipedia.org/wiki/ISO_week_date
The new added option is not mandatory and has a default value of 4, which means Pikadays current behavior is not altered when the option is not specified, it will default to the ISO 8601 rule.
(In the project I am currently working on, I already have the firstWeekOfYearMinDays rule available since cldr-data is loaded for the current user's region/culture (https://github.com/unicode-cldr/cldr-core/blob/master/supplemental/weekData.json).
The only small shortcoming I faced with respect to week numbers in Pikaday was to have the option that I implemented in this PR.