Correct invalid serialization of date/datetime/time/timedelta by pulling downcast checks up
#1851
+111
−22
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Change Summary
Modifies the pydantic-core serializers for
date,datetime,time, andtimedeltasuch that they perform their downcast checks first prior to performing any serialization logic. This fixes incorrect serialization with certain user-defined types and correctly emits warnings where we were incorrectly doing so ebfore.Related issue number
Fixes pydantic/pydantic#12439
Checklist
pydantic-core(except for expected changes)Selected Reviewer: @Viicos