Is your feature request related to a problem or challenge? Please describe what you are trying to do.

In a quest to have the fastest and most efficient Variant implementation I would like to avoid copies if at all possible

Right now, to make a VariantArray first requires completing an individual buffer and appending it
to the array.

Describe the solution you'd like
Let's make that faster by having the VariantBuilder append directly into the buffer

Describe alternatives you've considered

Additional context