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Sorry for the delay; CNY and Golden Week (as far as I could tell) aren't standardized to when people take off, so I ended up using a custom holidays file that listed 14 days before and 14 days after CNY, and 7 days (instead of 3) for Golden week, which is about when our factories were mostly non-operational.
Here's a slimmed down version of what we used, with only the dates listed in https://en.wikipedia.org/wiki/Public_holidays_in_China; Qīngmíng jié was simplified to just 15 days after the vernal equinox, which is equivalent, and simpler than finding the first day of the fifth solar term of the traditional Chinese lunisolar calendar.
Resolves #112