OData .NET 9 Preview 3 introduces breaking changes and modernizations including safer action query defaults that return null for nullable types, removal of ReadUntypedAsString requiring annotations inside structured objects, ReadOnlySpan overloads for allocation-free model lookups, replacement of legacy Date/TimeOfDay with System.DateOnly/TimeOnly, key alias support for complex properties, and fixes for .NET 8 obsoletion warnings and .NET 10 LINQ expression compatibility. The release removes EF CSDL support and custom transcoding in favor of framework APIs.
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