Parity: NSCoding: DateIntervalFormatter #2154
Merged
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Implement NSCoding for DateIntervalFormatter through new hooks in CFDateIntervalFormatter. This requires fixing several bugs uncovered in the process:
Correctly initialize CFDateIntervalFormatter’s date and time style.
Fix __NSSwiftData to never try to encode itself, matching what the Darwin counterpart does.
NSCalendar needs to check if a coder contains values for a specific key before trying to fetch that key.
Add tests with fixtures. Since time zone data can come from different ICU versions, only compare time zone names.
Prevent fixtures with duplicate identifiers.