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var buffer = new ArrayBufferWriter<byte>();
using (var w = new Utf8JsonWriter(buffer, new JsonWriterOptions { Indented = true }))
{
w.WriteStartArray();
w.WriteNumberValue(1);
w.WriteEndArray();
}
System.Console.WriteLine(System.Text.Encoding.UTF8.GetString(buffer.WrittenSpan).Count(c => c=='\n'));