PlainYearMonth parsing and Calendar field resolution cleanup/fixes #205
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This PR fixes some issues with handling
PlainYearMonth
's calendar field resolution as well as aligningPlainYearMonth::new_with_overflow
closer to the specification behavior.This PR does introduce a new internal API
IsoDate::regulate
, which does the regulation work without any date/time limit validations (year month has its ownyear_month_within_limits
validation).Tested on Boa locally, this does increase
Temporal.PlainYearMonth.from
conformance to near 100%. The remaining tests are related to other known issues: minus sign parsing and MonthCode validation.