Bug FastBufferWriter.WriteValue() won't accept unmanaged generic type T anymore?

EDIT: Of course I figure it out 2 seconds after posting this... unmanaged does not automatically mean the type satisfies the required constraints. Changing the function signature to

static FastBufferWriter CreateMessageWriter<T>(int bufferSize, T value) where T : unmanaged, IComparable, IConvertible, IComparable<T>, IEquatable<T> {}

does the trick. Carry on!

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So I just came back to a project that required a reinstall of the editor, and it gave me an error. I updated Netcode for GameObjects to v1.0.0 and now I'm here. I had written the following helper method:

Code (CSharp):

1. static FastBufferWriter CreateMessageWriter<T>(int bufferSize, T value) where T : unmanaged {
2.     using FastBufferWriter writer = new FastBufferWriter(bufferSize, Allocator.Temp);
3.     writer.TryBeginWrite(bufferSize);
4.     writer.WriteValue(value);
5.  
6.     return writer;
7. }

I'm 99% sure this used to work, and indeed even the current docs imply this:

However, I am still getting the following error on my

writer.WriteValue(value)

line:

Code (CSharp):

1. error CS0314: The type 'T' cannot be used as type parameter 'T' in the generic type or method 'FastBufferWriter.WriteValue<T>(in T, FastBufferWriter.ForNetworkSerializable)'. There is no boxing conversion or type parameter conversion from 'T' to 'Unity.Netcode.INetworkSerializable'.

What gives? Am I missing something, or did something break at some point? Gave this post the Bug flair for now, but happy to change to Question if that's more appropriate.

Thanks!