❔ ✅ Splitting string without allocation

        public static IEnumerable<ReadOnlyMemory<T>> Split<T>(this ReadOnlyMemory<T> memory, T separator)
            where T: IEquatable<T>
        {
            int start = 0;
            int end = 0;
            while (end < memory.Length)
            {
                if (memory.Span[end].Equals(separator) || end == memory.Length)
                {
                    yield return memory.Slice(start, end - start);
                    start = end + 1;
                }                
                end++;
            }

        }

public override Vector3 Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
{
    ReadOnlyMemory<char> vectorString = reader.GetString().AsMemory();
    var vectorValues = vectorString.Split(',').Select(s => float.Parse(s)).ToArray(); // Unable to parse `s` as it's not a string. What do?
    return new Vector3 { X = vectorValues[0], Y = vectorValues[1], Z = vectorValues[2] };
}