# API Difference 9.0-preview3 vs 9.0-preview4

API listing follows standard diff formatting.
Lines preceded by a '+' are additions and a '-' indicates removal.

* [System](9.0-preview4_System.md)
* [System.CodeDom.Compiler](9.0-preview4_System.CodeDom.Compiler.md)
* [System.Formats.Asn1](9.0-preview4_System.Formats.Asn1.md)
* [System.IO](9.0-preview4_System.IO.md)
* [System.IO.Pipes](9.0-preview4_System.IO.Pipes.md)
* [System.Numerics](9.0-preview4_System.Numerics.md)
* [System.Reflection.Emit](9.0-preview4_System.Reflection.Emit.md)
* [System.Runtime.CompilerServices](9.0-preview4_System.Runtime.CompilerServices.md)
* [System.Runtime.InteropServices](9.0-preview4_System.Runtime.InteropServices.md)
* [System.Runtime.Intrinsics](9.0-preview4_System.Runtime.Intrinsics.md)
* [System.Security.Cryptography](9.0-preview4_System.Security.Cryptography.md)
* [System.Text](9.0-preview4_System.Text.md)
* [System.Text.Json](9.0-preview4_System.Text.Json.md)
* [System.Text.Json.Nodes](9.0-preview4_System.Text.Json.Nodes.md)
* [System.Text.Json.Serialization](9.0-preview4_System.Text.Json.Serialization.md)
* [System.Text.Json.Serialization.Metadata](9.0-preview4_System.Text.Json.Serialization.Metadata.md)
* [System.Threading](9.0-preview4_System.Threading.md)
* [System.Threading.Channels](9.0-preview4_System.Threading.Channels.md)
* [System.Threading.Tasks](9.0-preview4_System.Threading.Tasks.md)

