Bug/Question: arrow's`FixedSizeList` is not roundtrippable

[universalmind303]

Bug

What happened:

Currently if you try to write an arrow FixedSizeList using delta, the original type is converted to a list. I'm wondering if this is a bug or intentional. Are there any suggested workarounds for working with arrow FixedSizeList without losing the fixed size?

What you expected to happen:
I'd expect being able to roundtrip arrow's FixedSizeList to/from delta without losing the original type.

How to reproduce it:

More details:

[ion-elgreco]

Intentional, the delta primitive types doesn't have a fixedsizedlist/array, only list