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@dependabot dependabot bot commented on behalf of github Dec 10, 2025

Updated MessagePack from 1.9.11 to 2.5.187.

Release notes

Sourced from MessagePack's releases.

2.5.187

Changes:

  • #​2014: Use a collision-resistant hash algorithm for untrusted data to address GHSA-4qm4-8hg2-g2xm
  • #​2010: Update published security policy

This list of changes was auto generated.

2.5.172

What's Changed

Full Changelog: MessagePack-CSharp/MessagePack-CSharp@v2.5.171...v2.5.172

2.5.171

What's Changed

Full Changelog: MessagePack-CSharp/MessagePack-CSharp@v2.5.168...v2.5.171

2.5.168

What's Changed

New Contributors

Full Changelog: MessagePack-CSharp/MessagePack-CSharp@v2.5.140...v2.5.168

2.5.140

What's Changed

New Contributors

Full Changelog: MessagePack-CSharp/MessagePack-CSharp@v2.5.129...v2.5.140

2.5.129

What's Changed

Full Changelog: MessagePack-CSharp/MessagePack-CSharp@v2.5.124...v2.5.129

2.5.124

What's Changed

New Contributors

Full Changelog: MessagePack-CSharp/MessagePack-CSharp@v2.5.108...v2.5.124

2.5.108

What's Changed

Full Changelog: MessagePack-CSharp/MessagePack-CSharp@v2.5.103...v2.5.108

2.5.103

What's Changed

New Contributors

Full Changelog: MessagePack-CSharp/MessagePack-CSharp@v2.5.94...v2.5.103

2.5.94

What's Changed

New Contributors

... (truncated)

2.5.64-alpha

What's Changed

New Contributors

Full Changelog: MessagePack-CSharp/MessagePack-CSharp@v2.4.23-alpha...v2.5.64-alpha

2.4.59

What's Changed

New Contributors

Full Changelog: MessagePack-CSharp/MessagePack-CSharp@v2.4.35...v2.4.59

2.4.35

Changes:

Enhancements:

  • #​1457: Add option to avoid large buffer allocations
  • #​1445: MessagePack.Generator RollForward to Major

Others:

  • #​1455: Add StringInterningFormatter.cs.meta for Unity
  • #​1448: Drop net5.0 runtime targets

This list of changes was auto generated.

2.4.23-alpha

What's Changed

New Contributors

Full Changelog: MessagePack-CSharp/MessagePack-CSharp@v2.4.14-alpha...v2.4.23-alpha

2.4.14-alpha

What's Changed

New Contributors

Full Changelog: MessagePack-CSharp/MessagePack-CSharp@v2.3.85...v2.4.14-alpha

2.3.112

What's Changed

New Contributors

Full Changelog: MessagePack-CSharp/MessagePack-CSharp@v2.3.85...v2.3.112

2.3.85

Changes:

  • #​1314: Skip setting fields when the ctor already took the value
  • #​1308: Readonly Dictionary with DataMember.Order is not being deserialized
  • #​1302: Refactory ObjectSerializationInfo.CreateOrNull
  • #​1300: Fix code generation for string-keyed objects with getter-only props and parameterized ctor.
  • #​1303: add unittest for DataContractSerializer compatibility

This list of changes was auto generated.

2.3.75

Changes:

Breaking

This release includes a behavioral breaking change (relative to our v2.2 releases) for better performance and avoid overriding default values when the msgpack stream does not include a value for that property (see #​1085)

Enhancements:

  • #​1277: Updating constructor matching for int keys

Others:

  • #​1264: Clearly document unity scenarios that require AOT

This list of changes was auto generated.

2.3.73-alpha

Changes:

Fixes:

  • #​1232: Failed to serialize/deserialize C#​9 records with StandardResolverAllowPrivate
  • #​1218: StandardResolverAllowPrivate overwrites readonly fields set in constructor
  • #​1134: Deserialization of generic types fails due to inability to find property setters that use init

Enhancements:

  • #​1288: Add support for C# 9 record types in mpc
  • #​1241: Allow private constructors for the ContractlessStandardResolver, when using ctor attribute
  • #​1187: Enable serialization IEnumerable and IReadOnlyDictionary descendants that have constructor with relevant collection
  • #​1217: Support for IReadOnlySet<T>
  • #​1213: Add ReadArrayHeaderAsync() and ReadMapHeaderAsync() to MessagePackStr…
See More
  • #​1176: AspNetCore.Mvc.Formatters Improvements
  • #​1108: Add System.Half support for .NET 5.0
  • #​1124: Target .NET Core 3.1 and 5.0 SDKs in mpc tool
  • #​1122: Offer API to adjust the ArrayPool
  • #​1095: Stop initializing members to their default values when deserializing where no data was provided for that member
  • #​1085: Use contractless resolver without setting default values for missing properties

Others:

  • #​1274: C# 9 Records are ignored by mpc code generator
  • #​1286: Fix C# record serialization when using StandardResolverAllowPrivate
  • #​1267: Fix handling of readonly private fields
  • #​1265: Merge master into develop
  • #​1259: Allow object that has either [MessagePackObject] or a valid [MessagePackFormatter()]
  • #​1229: Add support for IReadOnlySet<T>
  • #​1225: Merge v2.2 into v2.3
  • #​1205: Update PublicAPI analyzers
  • #​1204: Merge master into develop
  • #​1179: AspNetCore.Mvc.Formatters Improvements
  • #​1186: Define SPAN_BUILTIN for net5.0
  • #​1178: Merge master to develop
  • #​1137: Avoid MissingMethodException on generic classes with init property setters
  • #​1156: Adapt CtorParameterAndPropertySetterExists test for v2.3 behavior
  • #​1149: Benchmark serializer naming
  • #​1144: Benchmark cleanup
  • #​1136: Add tests for C# 9 records
  • #​1135: Update StyleCop.Analyzers to support C# 9 syntax
    ... (truncated)

2.3.58-alpha

Changes:

Fixes:

  • #​1190: AssemblyVersion always included / verified with boxed List
  • #​1134: Deserialization of generic types fails due to inability to find property setters that use init

Enhancements:

  • #​1213: Add ReadArrayHeaderAsync() and ReadMapHeaderAsync() to MessagePackStr…
  • #​1202: Make cctor defer Reflection that fails in AOT
  • #​1176: AspNetCore.Mvc.Formatters Improvements
  • #​1108: Add System.Half support for .NET 5.0
  • #​1124: Target .NET Core 3.1 and 5.0 SDKs in mpc tool
  • #​1122: Offer API to adjust the ArrayPool
See More
  • #​1095: Stop initializing members to their default values when deserializing where no data was provided for that member
  • #​1085: Use contractless resolver without setting default values for missing properties

Others:

  • #​1215: Add prepare_release.ps1 script
  • #​1195: [Unity] Azure Pipelines doesn't change package version
  • #​1203: Remove assembly version info from generic type arguments
  • #​1205: Update PublicAPI analyzers
  • #​1204: Merge master into develop
  • #​1168: InvalidOperationException: Sequence contains no matching element at MessagePack.MessagePackSecurity+ObjectFallbackEqualityComparer..cctor()
  • #​1179: AspNetCore.Mvc.Formatters Improvements
  • #​1186: Define SPAN_BUILTIN for net5.0
  • #​1175: Add target netcoreapp3.1
  • #​1178: Merge master to develop
  • #​1177: Fix break in master
  • #​1137: Avoid MissingMethodException on generic classes with init property setters
  • #​1156: Adapt CtorParameterAndPropertySetterExists test for v2.3 behavior
  • #​1155: Add test to document ctor+property setter behavior
  • #​1149: Benchmark serializer naming
  • #​1144: Benchmark cleanup
  • #​1136: Add tests for C# 9 records
  • #​1135: Update StyleCop.Analyzers to support C# 9 syntax
  • #​1125: MPC: nullable enable and update language version to 9.
  • #​1123: MPC: Unify Formatter Name between int-key and string-key
  • #​1120: Remove VSIX and use dotnet build in AzP
  • #​1114: Remove analyzer VSIX
    ... (truncated)

2.2.113

Changes:

Fixes:

  • #​1251: ByteArrayFormatter should allow deserializing fixarray of bytes

Enhancements:

  • #​1277: Updating constructor matching for int keys

Others:

  • #​1264: Clearly document unity scenarios that require AOT
  • #​1263: Use AssemblyBuilderAccess.RunAndCollect instead of AssemblyBuilderAccess.Run
  • #​1262: Suppress the only build warning we have
  • #​1252: Allow deserializing byte[] from a msgpack array
  • #​1254: Update from Library.Template
See More
  • #​1244: init.ps1 fails if the repo is stored in a path that has spaces in the name
  • #​1248: Add Odin Serializer to the benchmark (round 2)
  • #​1219: Bump Microsoft.AspNetCore.Mvc.Abstractions from 1.1.2 to 1.1.3 in /src/MessagePack.AspNetCoreMvcFormatter
  • #​1223: Fix readme about mpc
  • #​1192: Fix mpc ignore generic type defined in out side target
  • #​1111: MessagePackGenerator (mpc.exe) ignore generic type definition, that defined outside target project.

This list of changes was auto generated.

2.2.85

Changes:

Fixes:

  • #​1097: MessagePackFormatter(typeof(TypelessFormatter)) throws exception during Serialization
  • #​886: DataMember attribute for properties with inheritance

Enhancements:

  • #​1096: Add xml doc comments to CodeGenHelpers

Others:

  • #​1110: record note to ReadMe
  • #​1109: Fix MessagePackWindow can not run mpc command
  • #​1090: Add descriptions about MessagePack.Experimental.
  • #​1099: Fix mpc arg documentation
See More
  • #​1107: Simplify #if netcoreapp filters
  • #​1106: UriFormatter should use Uri.OriginalString when serializing
  • #​1100: Fix [MessagePackFormatter(TypelessFormatter)]
  • #​1087: MessagePackSerializer.NonGeneric uses reflection directly on Unity IL2CPP
  • #​1078: Typeless supports interface and abstract
  • #​1089: Support where constraints in mpc.exe string-key.
  • #​1083: Fix handling of [DataMember] that appears on virtual and override properties
  • #​1071: add MessagePack.Annotations.asmdef
  • #​1070: add *.meta
  • #​1069: Json-serialized anonymous type produces... base64?

This list of changes was auto generated.

2.2.60

Changes:

Fixes:

  • #​1048: Fix handling nested generic types in code generation
  • #​1047: Fix handling type parameter constraints in code generation
  • #​1063: Fix support of custom implementation of ICollection

Enhancements:

  • #​1064: DynamicObjectTypeFallbackFormatter prioritize PrimitiveObjectFormatter to keep primitive type
  • #​861: mpc: More aggressive ahead of time optimization for string-key type formatter.
  • #​1053: General Unsafe Formatters
  • #​1054: Enable deserialization constructors to use parameter names that match their property names
  • #​1061: Allow ctor parameter types to be anything assignable from their associated members
  • #​12 Add TypelessSerializer(Resolver)

Others:

  • #​1050: Use more inclusive language in code
  • #​1044: Static ReadOnlySpan optimization reduces memory allocation

This list of changes was auto generated.

2.2.44-rc

Changes:

Fixes:

  • #​1002: mpc doesn't support Union attributes with type names

Enhancements:

  • #​988: Add MessagePack.Experimental package which includes SIMD(Single Instruction Multiple Data) accelerated primitive array formatters.
  • #​1029: Merge immutable collections formatters into main library
  • #​1027: Add ReadOnlyMemory<T> and ReadOnlySequence<T> support
  • #​960: Add a built-in formatter for System.Type
  • #​912: Make a proper dotnet mpc tool

Others:

  • #​1043: Merge master into v2.2
See More
  • #​1039: Merge master into v2.2 branch
  • #​1036: Merge master into v2.2 branch
  • #​948: Add support for ExpandoObject
  • #​1019: mpc - add externalIgnoreTypeNames feature
  • #​1015: Merge master to v2.2
  • #​1005: Correctly identify and throw on unsupported mpc case
  • #​995: Add xml snippet of how to customize mpc build task
  • #​992: Merge master to v2.2
  • #​656: Use MSBuild OM for what it's good for
  • #​962: Merge master to v2.2 branch
  • #​947: Add built-in Memory formatters
  • #​363: Allow using of UnionAttribute for interfaces separated from implementation

This list of changes was auto generated.

2.2.36-alpha

Changes:

Fixes:

  • #​1003: mpc for nested types broken

Enhancements:

  • #​948: Add support for ExpandoObject
  • #​1029: Merge immutable collections formatters into main library
  • #​1027: Add ReadOnlyMemory<T> and ReadOnlySequence<T> support
  • #​960: Add a built-in formatter for System.Type
  • #​912: Make a proper dotnet mpc tool

Others:

  • #​1019: mpc - add externalIgnoreTypeNames feature
See More
  • #​1015: Merge master to v2.2
  • #​1012: fix(1011): Override references to load *.dll without autoReference:true
  • #​1005: Correctly identify and throw on unsupported mpc case
  • #​1004: mpc fixes and Generated.cs refresh
  • #​1002: mpc doesn't support Union attributes with type names
  • #​1001: remove unused .meta
  • #​995: Add xml snippet of how to customize mpc build task
  • #​992: Merge master to v2.2
  • #​656: Use MSBuild OM for what it's good for
  • #​962: Merge master to v2.2 branch
  • #​947: Add built-in Memory formatters
  • #​363: Allow using of UnionAttribute for interfaces separated from implementation

This list of changes was auto generated.

2.1.194

Changes:

Fixes:

  • #​1033: default(ImmutableArray) is not serialized correctly
  • #​1025: Internal enums trip up StandardResolverAllowPrivate
  • #​1006: Fix deserialize typeless extension without typeless formatter specified
  • #​1035: Lock for all Ref.Emit code when on mono
  • #​1031: Fix handling of non-public enums when using AllowPrivate resolvers
  • #​987: System.ExecutionEngineException encountered that should be a MessagePackSerializationException
  • #​1018: mpc - Ignore [MessagePackFormatter] type collect

Enhancements:

  • #​1041: Use Array.Empty<T>() instead of new T[] wherever possible

Others:

  • #​1030: Run net472 tests on mono
  • #​1010: Improve generation of generic formatters
  • #​1008: use ExpressionTree.Compile(preferInterpretation: true) for Unity IL2CPP

2.1.165

Changes:

  • #​997: Add packagejson and enable .meta for Unity
  • #​996: creating DynamicAssembly to lazy
  • #​994: Mpc support for generic class unions
  • #​978: warning disable 0162 for unity
  • #​964: Unity IL2CPP generic object wrapper code gen
  • #​982: Fixed deserialization on static constructor
  • #​981: Update MessagePackReader.cs
  • #​976: Add BSON implementation from Json.NET
  • #​975: Shared projects were still not correctly parsed on Linux.
  • #​972: Fix #​971 Shared Projects incorrecly included.
See More
  • #​971: Shared Projects have unexpected behavoiur in mpc

This list of changes was auto generated.

2.1.152

Changes:

Fixes:

  • #​833: MessagePackCodeFixProvider crash on code fixit

Others:

  • #​956: Fix msgpack003-005 analyzer and add tests
  • #​966: Move SequenceReader into our own namespace
  • #​961: Update StyleCop.Analyzers and NB.GV version
  • #​957: Fix can not compile on Unity Android build
  • #​958: Apply latest Library.Template scripts

This list of changes was auto generated.

2.1.143

Changes:

Fixes:

  • #​924: Attempted to read past the end of the stream when using LZ4ArrayCompression
  • #​931: il2cpp - MemoryMarshal.Cast can cause SIGBUS on ARMv7

Enhancements:

  • #​935: Allow analyzer VSIX to install on VS 2019
  • #​902: Add support generic MessagePackFormatterAttribute
  • #​913: Make MessagePack.MSBuild.Task package a dev dependency

Others:

  • #​946: Fix MessagePackStreamReader reading when string or binary headers are incomplete
  • #​945: Document that formatters must write exactly one object
See More
  • #​932: Avoid using MemoryMarshal.Cast<byte, _> on Android
  • #​940: Fix deserialization of big files
  • #​936: Merge v1.x to master
  • #​748: Unity & Messagepack v2.x Error on some Android devices.
  • #​923: Reworked anonymous type check.
  • #​921: [mpc]: Ignore missing Include attribute in PackageReference tag
  • #​915: Improve docs
  • #​891: [mpc] Fix collecting closed type generics
  • #​885: Allow serialize completely private constructor
  • #​883: add Table of Contents to ReadMe
  • #​881: Fix invalid bge-emit on string-key dynamic code gen
  • #​882: Normalize End-of-Lines
  • #​866: MPC. Fix double include of MessagePackObjectAttribute data

This list of changes was auto generated.

2.1.115

Changes:

Fixes:

  • #​829: Fix serialization of private properties on base classes
  • #​821: Fix serialization of private fields in base classes
  • #​818: Fix compiler error on Unity + .NET Standard 2.0 + generated Union code
  • #​855: Fix MessagePackStreamReader.Dispose to allow double-disposal
  • #​828: Private properties on base class do not get serialized
  • #​820: Private fields on base class do not get serialized

Enhancements:

  • #​824: Add caching of dynamic formatters

Others:

  • #​854: Port fix to Sequence from Nerdbank.Streams
  • #​852: Link For Unity is broken.
  • #​853: Remove sandbox\XamarinAndroid
  • #​849: Remove unused ENABLE_UNSAFE_MSGPACK
  • #​848: Replaced Span.Fill(0) with Span.Clear()
See More
  • #​830: Generics in mpc 2 simpler faster
  • #​843: mpc fix, generate collect class name in nested enum.
  • #​825: Rename writer -> reader in BuildDeserialize

This list of changes was auto generated.

2.1.90

Changes:

Fixes:

  • #​795: avoid ReadUnaligned on long, ulong, double in Android device
  • #​811: Fix MessagePackSecurity.GetEqualityComparer<object> to not return null

Enhancements:

  • #​809: Add secure hashing for enums with backing integers of 32-bit or less

2.1.80

Changes:

🔒 Security fixes are included in this release. Read more in our security advisory.

Fixes:

  • #​782: Strings with UTF8 multi-byte characters are corrupted in writing on mono
  • #​774: Apply LZ4BlockArray to ConvertToJson
  • #​651: Typeless decimal serialized as string
  • #​425: TypelessContractlessStandardResolver should preserve various integer types

Enhancements:

  • #​790: Add the leaveOpen flag to MessagePackStreamReader
  • #​788: Respect EnumMemberAttribute when serializing enum values as strings
  • #​253: Default resolver deserializes ICollection as T[]
  • #​771: Add WriteBinHeader and WriteStringHeader methods to MessagePackWriter
See More
  • #​767: Add MessagePackReader.TryRead*Header methods
  • #​726: Add MessagePackStreamReader.ReadArrayAsync
  • #​757: Wrap all exceptions thrown from ConvertToJson in MessagePackSerializationException
  • #​735: Make MessagePackReader.ReadDateTime(ExtensionHeader) public

Others:

  • #​795: avoid ReadUnaligned on long, ulong, double in Android device
  • #​789: Respect EnumMemberAttribute when serializing enum values as strings
  • #​787: Fix mpc formatter name for Queue
  • #​786: Fix WriteString issue on mono
  • #​784: improve BigInteger serialize in .NET Core
  • #​781: Fix enum serialization in unity
  • #​779: mpc, does not load does't exists metadata
  • #​768: Bring back serialization of members with explicit attributes
  • #​775: Fix leaked use fullnamespace in mpc
  • #​777: Improve performance of standard decimal serialization by using Utf8Formatter
  • #​778: Deserialize mutable collection interfaces with mutable concrete types
  • #​769: Add analyzers to call out use of static options
  • #​279: Add MessagePackBinary.WriteBinHeader
  • #​763: mpc, replace MicroBatchFramework to ConsoleAppFramework
  • #​770: Package and toolset updates
  • #​766: Readonly attributes and getters with Key() annotation are ignored by SerializeObject()
  • #​762: Update Generated.cs
  • #​759: Document subtle changes in serialization from v1.x to v2.x
  • #​761: Merge v2.0 to master
    ... (truncated)

2.0.335

Changes:

Fixes:

  • #​764: MessagePackStreamReader throws when stream returns a block that ends just before array or map element
  • #​760: Fix API doc on MessagePackWriter.WriteInt64
  • #​753: Fix duplicate header read in ConvertToJson in ext format
  • #​746: ContractlessStandardResolver fails to serialize ReadOnlySequence<byte> that it deserialized

Others:

  • #​765: Fix MessagePackStreamReader to not throw given certain message boundaries
  • #​749: Copy byte[] during contractless deserialization

This list of changes was auto generated.

2.0.323

Changes:

Upgrading from 1.x? See our migration doc.

Fixes:

  • #​710: Causes infinite loop when the IBufferWriter returns zerospan in sizehint=0
  • #​712: ByteArraySegmentFormatter returns inner sequence directly instead of copying
  • #​706: MPC should normalize directory separators in paths read from csproj

Enhancements:

  • #​720: MessagePack.AspNetCoreMvcFormatter supports AspNetCore3 BodyWriter
  • #​718: Add IBufferWriter<byte> overload to NonGeneric API
  • #​711: Could MessagePackWriter.GetSpan/Advance be public?
  • #​699: Add MessagePackStreamReader

Others:

See More
  • #​730: Prepare for stable 2.0 release
  • #​729: Fix mpc and more details to ReadMe
  • #​728: ReadMe fix(mpc, Unity)
  • #​722: Add assembly locations for wellknown generic types to mpc
  • #​719: Add NonGeneric API for Serialize with IBufferWriter and deserialize with ReadOnlySequence
  • #​715: Avoid infinite loop when IBufferWriter.GetMemory returns empty memory
  • #​714: Make MessagePackWriter's GetSpan and Advance methods public
  • #​713: Always copy arrays from the underlying sequence
  • #​485: Enable MessagePackWriter.WriteRaw(ReadOnlySpan) to accept a stackalloc span
  • #​707: Convert backslashes to slashes in csproj for mpc off Windows
  • #​698: StaticCompositeResolver.Register -> StaticCompositeResolver.Instance.…
  • #​692: Update SerializerBenchmark
  • #​696: Set release notes link to match release tag
  • #​694: Compression Document

This list of changes was auto generated.

2.0.299-rc

Changes:

Fixes:

  • #​680: Allocate too small buffer each times in LZ4 serialization

Enhancements:

  • #​690: Fix CreatePeekReader so it's truly equivalent to the original
  • #​681: Add Compression.LZ4ContiguousBlock and implementation
  • #​677: API support for multiple compression schemes

Others:

  • #​695: Avoid double-enumeration when serializing unknown collection types
  • #​693: Bring back -rc suffix
  • #​691: Replace all creation of Sequence except in SequencePool
See More
  • #​688: new Sequence should not use because that allocate many small buffers.
  • #​687: Remove formatter instance cache from TypelessFormatter
  • #​689: Avoid the large object heap (LOH) for LZ4 buffers
  • #​686: Remove private resolver list from DynamicObjectTypeFallbackFormatter
  • #​685: Use recycled Sequence for LZ4 compression
  • #​679: Why does DynamicObjectTypeFallbackFormatter have a private collection of resolvers?
  • #​682: Update documentation for removal of LZ4Standard
  • #​676: Documentation errors
  • #​673: Remove explicit MessagePack.Annotations dependency from extension packages
  • #​674: Document location of our CI feed

This list of changes was auto generated.

API diff:

diff --git a/src/MessagePack/PublicAPI.Unshipped.txt b/src/MessagePack/PublicAPI.Unshipped.txt
index 275f4c3..69cbbaf 100644
-MessagePack.Formatters.DynamicObjectTypeFallbackFormatter.DynamicObjectTypeFallbackFormatter(params MessagePack.IFormatterResolver[] innerResolvers) -> void
-MessagePack.Formatters.TypelessFormatter.TypelessFormatter() -> void
+MessagePack.MessagePackCompression
+MessagePack.MessagePackCompression.Lz4Block = 1 -> MessagePack.MessagePackCompression
+MessagePack.MessagePackCompression.Lz4BlockArray = 2 -> MessagePack.MessagePackCompression
+MessagePack.MessagePackCompression.None = 0 -> MessagePack.MessagePackCompression
-MessagePack.MessagePackSerializerOptions.MessagePackSerializerOptions(MessagePack.IFormatterResolver resolver, bool useLZ4Compression = false) -> void
+MessagePack.MessagePackSerializerOptions.Compression.get -> MessagePack.MessagePackCompression
 ... (truncated)

## 2.0.270-rc



## Changes:


### Fixes:


* #​662: Failed to deserialize 2 consecutive messages from a Stream using NonGeneric API in v1.8.80
* #​499: MVC output Formatter does not check correctly for contenttype
* #​567: Eliminate remaining mutable statics
* #​562: Overlap Buffer.MemoryCopy causes unknown error

### Enhancements:


* #​648: Move extension type codes
* #​649: Add v1->v2 migration doc
* #​632: Add MessagePackReader.ReadRaw()
* #​608: Offer MessagePackSerializerOptions to collection deserializers
<details><summary><b>See More</b></summary>

* #​609: Add fast path for reading consecutive strings/byte arrays
* #​513: v2 StringKey(Contractless) deserialization is slow
* #​603: Add CancellationToken to reader/writer structs
* #​598: Take CancellationToken parameter in serialize/deserialize methods
* #​582: Improve compatibility with existing types
* #​594: Add CancellationToken parameters to synchronous Stream (de)serialize methods
* #​595: Apply vs-threading analyzers and fix issues they found
* #​444: TypelessFormatter blacklist handling is insufficient
* #​576: [Request] NonGeneric Serialize method with the MessagePackWriter
* #​574: Don't convert Span to array before pinning

### Others:


* #​669: Fix nuget package ID for mpc tool back to `MessagePack.Generator`
* #​670: Include asmdef in package exporter
* #​667: Improve Readme
* #​668: Collect all mpc executables under one artifact
* #​661: Add MessagePackWindow and some fixes
* #​663: Stream deserialization fixes
* #​657: Throw msg exception before build nonpublic formatter.
* #​659: fix nugetpackagepath typo in Mac/Linux
* #​655: Add substitute formatters and resolvers
* #​658: Downgrade to System.Collections.Immutable 1.5.0
* #​654: System.Collections.Immutable 1.6.0 breaks Azure Functions
* #​646: Fix StandardResolverAllowPrivate exception
* #​653: use Microsoft.Extensions.FileSystemGlobbing to mpc
* #​652: Reduce number of build tasks
 ... (truncated)

Commits viewable in [compare view](https://github.com/MessagePack-CSharp/MessagePack-CSharp/compare/v1.9.11...v2.5.187).
</details>

[![Dependabot compatibility score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=MessagePack&package-manager=nuget&previous-version=1.9.11&new-version=2.5.187)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores)

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting `@dependabot rebase`.

[//]: # (dependabot-automerge-start)
[//]: # (dependabot-automerge-end)

---

<details>
<summary>Dependabot commands and options</summary>
<br />

You can trigger Dependabot actions by commenting on this PR:
- `@dependabot rebase` will rebase this PR
- `@dependabot recreate` will recreate this PR, overwriting any edits that have been made to it
- `@dependabot merge` will merge this PR after your CI passes on it
- `@dependabot squash and merge` will squash and merge this PR after your CI passes on it
- `@dependabot cancel merge` will cancel a previously requested merge and block automerging
- `@dependabot reopen` will reopen this PR if it is closed
- `@dependabot close` will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
- `@dependabot show <dependency name> ignore conditions` will show all of the ignore conditions of the specified dependency
- `@dependabot ignore this major version` will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
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- `@dependabot ignore this dependency` will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)
You can disable automated security fix PRs for this repo from the [Security Alerts page](https://github.com/dotnet/performance/network/alerts).

</details>

---
updated-dependencies:
- dependency-name: MessagePack
  dependency-version: 2.5.187
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
@dependabot dependabot bot added .NET Pull requests that update .net code dependencies Pull requests that update a dependency file labels Dec 10, 2025
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