Is your feature request related to a problem? Please describe.
Cannot describe street cleaning that alternate weeks using existing timespans. Ex. 1st and 3rd week of month
Describe the solution you'd like
Add field weeks_of_month array to timespan that takes integers. 1 = 1st week, 2 = 2nd week...
Is this a breaking change
Impacted Spec
Describe alternatives you've considered
Creating a designated_period for 1st week, 2nd week, etc. but this will make it harder to parse timespans for the purpose of detecting conflicts in policies with overlapping timespans and equal priority