# Array promotion: too eager?
**URL:** https://discourse.julialang.org/t/array-promotion-too-eager/86422
**Category:** General Usage
**Created:** [August 27, 2022, 8:52am UTC](https://discourse.julialang.org/t/array-promotion-too-eager/86422 "2022-08-27T08:52:37Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@aplavin](https://discourse.julialang.org/u/aplavin)
#### Post date: [August 27, 2022, 8:52am UTC](https://discourse.julialang.org/t/array-promotion-too-eager/86422/1 "2022-08-27T08:52:37Z")
I’ve noticed that recent 1.9 nightlies became more eager in converting array elements to a common type. This seems unambiguously breaking, and not sure about the motivation: what were the reasons for such a change?
For example, 1.8 properly keeps both original values as-is:
```julia
julia> using StructArrays
julia> A = [StructArray([1+2im]), [3]];
julia> A[1]
1-element StructArray(::Vector{Int64}, ::Vector{Int64}) with eltype Complex{Int64}:
1 + 2im
julia> A[2]
1-element Vector{Int64}:
3
```
While nightly Julia changes types of both elements:
```julia
julia> A = [StructArray([1+2im]), [3]];
julia> A[1]
1-element Vector{Complex{Int64}}:
1 + 2im
julia> A[2]
1-element Vector{Complex{Int64}}:
3 + 0im
```
This changes the meaning of perfectly fine and working code.
---
### Author:  [@jakobnissen](https://discourse.julialang.org/u/jakobnissen)
#### Post date: [August 27, 2022, 9:05am UTC](https://discourse.julialang.org/t/array-promotion-too-eager/86422/2 "2022-08-27T09:05:02Z")
This might be the same as [Change in `AbstractArray` promotion · Issue #45511 · JuliaLang/julia · GitHub](https://github.com/JuliaLang/julia/issues/45511) which indeed was .a mistake, and will be fixed before the 1.9 release.