Describe the bug

IBufferWriterExtension.Write method for unmanaged types creates a Span with invalid length:

        int length = sizeof(T);
        Span<byte> span = writer.GetSpan(1);

should be:

        int length = sizeof(T);
        Span<byte> span = writer.GetSpan(length);

That causes System.ArgumentException : The current buffer writer can't contain the requested input data. at runtime.

Regression

No response

Steps to reproduce

Leave only one byte of free capacity and write a larger unmanaged type:

        using var buffer = new ArrayPoolBufferWriter<byte>(16);

        var count = buffer.Capacity - 1;
        for (int i = 0; i < count; i++)
        {
            buffer.Write<byte>(0);
        }

        buffer.Write(1.0);

Expected behavior

It should grow the buffer accordingly.

Screenshots

No response

IDE and version

VS 2022

IDE version

No response

Nuget packages

• CommunityToolkit.Common
• CommunityToolkit.Diagnostics
• CommunityToolkit.HighPerformance
• CommunityToolkit.Mvvm (aka MVVM Toolkit)

Nuget package version(s)

8.2.2

Additional context

No response

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