How do I serialize an F# record without having it output duplicate fields with @ signs at the end?

[mrakgr]

Example code:

#r "nuget: YamlDotNet, 16.3.0"
open YamlDotNet
open System

[<CLIMutable>]
type t = {
    qwer : string
    asdf : int
}

let t = {
    qwer = "hello"
    asdf = 1234
}

let serializer = new Serialization.Serializer()
serializer.Serialize(Console.Out, t)

Here is what it outputs when I run it.

qwer@: hello
asdf@: 1234
qwer: hello
asdf: 1234

How do I prevent it from generating those extraneus duplicate fields ending in @?

[mrakgr]

Here is another example. The results this library is giving me are bonkers.

#r "nuget: YamlDotNet, 16.3.0"
open YamlDotNet.Serialization
open YamlDotNet.Serialization.NamingConventions

[<CLIMutable>]
type t = {
    Qwerty : string
    Asdf : int
}

let t = {
    Qwerty = "hello"
    Asdf = 1234
}

let serializer =
    SerializerBuilder()
        .WithNamingConvention(CamelCaseNamingConvention.Instance)
        .Build()

serializer.Serialize([|t;t;t|])
|> printfn "%s"

Running the script with dotnet fsi gives me:

- &o0
  qwerty@: hello
  asdf@: 1234
  qwerty: hello
  asdf: 1234
- *o0
- *o0

[mrakgr]

The library does have tests that look sensible, so I am confused what the problem is.