similar() of ArrayPartition involving primitives fails

[davidschlegel]

If I have an ArrayPartition involving a primitive type, such as a regular number, creating a similar through similar array fails.
Example:

using RecursiveArrayTools
a = randn()
b = randn(5,5)
arr_part = ArrayPartition(a,b)
similar(arr_part) # fails

ArrayPartitions are not designed for single numbers, but it would be nice if it also works for these types.

[ChrisRackauckas]

I'm not entirely sure what this would give. Given similar generates a mutable object, it cannot be an ArrayPartition of numbers since that's not mutable. But it needs the tuples to be an array partition, and putting things in arrays would change the underlying structure.

[davidschlegel]

I was already guessing that primitives being immutable are at the heart of the problem. Could one then just disallow ArrayPartition involving primitives? Of course, one could always wrap them into an array, where it always works (ArrayPartition([a], b) in my example)...

[ChrisRackauckas]

There's some dispatches and type signatures that rely on it being a tuple right now, so that would need some word to be fully generalized.