{"record":{"id":"ffcbb70eb3824a3e","repo":"clockworklabs/SpacetimeDB","slug":"byte-array-must-be-exactly-size-bytes-long","errorCode":null,"errorMessage":"Byte array must be exactly {Size} bytes long.","messagePattern":"Byte array must be exactly (.+?) bytes long\\.","errorType":"exception","errorClass":"ArgumentException","httpStatus":null,"severity":"error","filePath":"crates/bindings-csharp/BSATN.Runtime/BSATN/U128.cs","lineNumber":42,"sourceCode":"    /// <summary>Initializes a new instance of the <see cref=\"U128\" /> struct.</summary>\n    /// <param name=\"upper\">The upper 64-bits of the 128-bit value.</param>\n    /// <param name=\"lower\">The lower 64-bits of the 128-bit value.</param>\n    public U128(ulong upper, ulong lower)\n    {\n        _upper = upper;\n        _lower = lower;\n    }\n\n    internal ulong Lower => _lower;\n\n    internal ulong Upper => _upper;\n\n    /// Returns a <see cref=\"U128\" /> from a big-endian byte array.\n    public static U128 FromBytesBigEndian(ReadOnlySpan<byte> bytes)\n    {\n        if (bytes.Length != Size)\n        {\n            throw new ArgumentException(\n                $\"Byte array must be exactly {Size} bytes long.\",\n                nameof(bytes)\n            );\n        }\n\n        var upper = BinaryPrimitives.ReadUInt64BigEndian(bytes[..8]);\n        var lower = BinaryPrimitives.ReadUInt64BigEndian(bytes[8..16]);\n\n        return new U128(upper, lower);\n    }\n\n    public byte[] ToBytesBigEndian()\n    {\n        var bytes = new byte[Size];\n\n        BinaryPrimitives.WriteUInt64BigEndian(bytes.AsSpan(0, 8), _upper);\n        BinaryPrimitives.WriteUInt64BigEndian(bytes.AsSpan(8, 8), _lower);\n","sourceCodeStart":24,"sourceCodeEnd":60,"githubUrl":"https://github.com/clockworklabs/SpacetimeDB/blob/524b4487d949b61a07d4f39c862d1290259dfd20/crates/bindings-csharp/BSATN.Runtime/BSATN/U128.cs#L24-L60","documentation":"Error \"Byte array must be exactly {Size} bytes long.\" thrown in clockworklabs/SpacetimeDB.","triggerScenarios":"Thrown at crates/bindings-csharp/BSATN.Runtime/BSATN/U128.cs:42 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":[],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"524b4487d949b61a07d4f39c862d1290259dfd20","analyzedAt":"2026-08-16T23:58:54.611Z","schemaVersion":2},"datasetVersion":"2026-08-17T04:17:16.089Z"}