API diff between .NET 9 RC2 and .NET 9 GA (#9601)

release-notes/9.0/preview/ga/api-diff/Microsoft.AspNetCore.App/9.0-ga.md

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+# API Difference 9.0-rc2 vs 9.0-ga
+
+API listing follows standard diff formatting.
+Lines preceded by a '+' are additions and a '-' indicates removal.
+
+

release-notes/9.0/preview/ga/api-diff/Microsoft.NETCore.App/9.0-ga.md

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+# API Difference 9.0-rc2 vs 9.0-ga
+
+API listing follows standard diff formatting.
+Lines preceded by a '+' are additions and a '-' indicates removal.
+
+* [System](9.0-ga_System.md)
+

release-notes/9.0/preview/ga/api-diff/Microsoft.NETCore.App/9.0-ga_System.md

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+# System
+
+``` diff
+ namespace System {
+     public sealed class String : ICloneable, IComparable, IComparable<string?>, IConvertible, IEnumerable, IEnumerable<char>, IEquatable<string?>, IParsable<string>, ISpanParsable<string> {
+-        public String Trim(ReadOnlySpan<char> trimChars);
+
+-        public String TrimEnd(ReadOnlySpan<char> trimChars);
+
+-        public String TrimStart(ReadOnlySpan<char> trimChars);
+
+     }
+ }
+```
+

release-notes/9.0/preview/ga/api-diff/Microsoft.WindowsDesktop.App/9.0-ga.md

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+# API Difference 9.0-rc2 vs 9.0-ga
+
+API listing follows standard diff formatting.
+Lines preceded by a '+' are additions and a '-' indicates removal.
+
+* [System.Formats.Nrbf](9.0-ga_System.Formats.Nrbf.md)
+

release-notes/9.0/preview/ga/api-diff/Microsoft.WindowsDesktop.App/9.0-ga_System.Formats.Nrbf.md

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+# System.Formats.Nrbf
+
+``` diff
+ namespace System.Formats.Nrbf {
+     public abstract class ArrayRecord : SerializationRecord {
+-        public virtual long FlattenedLength { get; }
+
+     }
+     public static class NrbfDecoder {
+-        public static SerializationRecord Decode(Stream payload, out IReadOnlyDictionary<SerializationRecordId, SerializationRecord> recordMap, PayloadOptions options = null, bool leaveOpen = false);
++        public static SerializationRecord Decode(Stream payload, out IReadOnlyDictionary<SerializationRecordId, SerializationRecord> recordMap, PayloadOptions? options = null, bool leaveOpen = false);
+     }
+-    public struct SerializationRecordId : IEquatable<SerializationRecordId>
++    public readonly struct SerializationRecordId : IEquatable<SerializationRecordId>
+ }
+```
+

release-notes/9.0/preview/ga/api-diff/README.md

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+# .NET 9.0 GA API Changes
+
+The following API changes were made in .NET 9.0 GA:
+
+- [Microsoft.NETCore.App](./Microsoft.NETCore.App/9.0-ga.md)
+- [Microsoft.AspNetCore.App](./Microsoft.AspNetCore.App/9.0-ga.md)
+- [Microsoft.WindowsDesktop.App](./Microsoft.WindowsDesktop.App/9.0-ga.md)