When to use iarray instead of array?

[jbe]

@jbe

@otini

Note that Dynarray.unsafe_to_iarray exists, […]

It only exists for Dynarray but not for Iarray? Is there a reason for that? […]

I guess that for unsafely converting an array to an Iarray.t, I simply would use Obj.magic, e.g.:

let unsafe_array_to_iarray : 'a array -> 'a Iarray.t = Obj.magic
let unsafe_iarray_to_array : 'a Iarray.t -> 'a array = Obj.magic