Thorough tests for ISO-like calendar math #3201
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Splits test/thorough/gregorian.mjs into two new test files:
calendarisolike.mjs tests that the year and month differences for the four ISO-like calendars are equal to the same differences calculated in the ISO calendar.
calendardaymath.mjs tests that week and day differences for all non-ISO calendars (except, temporarily, 'chinese' and 'dangi') are equal to the same differences calculated in the ISO calendar. (Days are always equivalent, and weeks are always 7 days in all currently supported calendars.)
This is in order to test the simplest invariants in other non-ISO calendars and not just 'gregory'.