month duration for non-gregorian calendars returns UnInt when it is not uncertain #140
Description
Likely introduced in v0.5 when improving duration logic for ambiguous dates.
For non-ambiguous non-gregorian dates, we can either use the delta earliest/latest Gregorian dates or the month duration from the calendar converter. (These should agree and may be a helpful check to confirm logic).
To reproduce:
All of the dates and calendars parsed below should return integers; none of them should return UnInt values. This is a result of the duration logic using both Gregorian months in range for the converted date.
Tammuz 1288 Seleucid 1288-04 month 0977-06-26 0977-07-24 UnInt(lower=29, upper=30)
1337 Seleucid 1337 year 1025-09-03 1026-09-20 355
Tevet 1548 Seleucid 1548-10 month 1236-12-07 1237-01-04 29
Elul 1428 Seleucid 1428-06 month 1117-08-08 1117-09-05 UnInt(lower=29, upper=30)
First decade of Ḥeshvan 1442 Seleucid 1442-08 month 1130-10-13 1130-11-10 UnInt(lower=29, upper=30)
Shawwāl 425 Hijrī 0425-10 month 1034-08-25 1034-09-22 UnInt(lower=29, upper=30)
Ḥeshvan 1453 Seleucid 1453-08 month 1141-10-11 1141-11-08 UnInt(lower=29, upper=30)
Shevat (4)791 Anno Mundi 4791-11 month 1031-01-03 1031-02-01 UnInt(lower=29, upper=30)
Heshvan 4800 Anno Mundi 4800-08 month 1039-10-28 1039-11-26 UnInt(lower=29, upper=30)