fix: proper eltype in wrong-mode pushforward/pullback (#1003)

* fix: proper eltype in wrong-mode pushforward/pullback

* Fix

* Without type parameter to avoid angering Aqua

* Changelog

Author: gdalle

DifferentiationInterface/CHANGELOG.md

@@ -13,6 +13,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Add support for HyperHessians backend ([#940](https://github.com/JuliaDiff/DifferentiationInterface.jl/pull/940))
 
+### Fixed
+
+- Proper eltype in wrong-mode pushforward/pullback ([#1003](https://github.com/JuliaDiff/DifferentiationInterface.jl/pull/1003))
+
 ## [0.7.17](https://github.com/JuliaDiff/DifferentiationInterface.jl/compare/DifferentiationInterface-v0.7.16...DifferentiationInterface-v0.7.17)
 
 ### Fixed

DifferentiationInterface/src/utils/linalg.jl

@@ -44,5 +44,5 @@ Convert an array of tuples `tx` into a tuple of arrays, while respecting the arr
 arroftup_to_tupofarr(tx::NTuple{B, <:Number}, x::Number) where {B} = tx
 
 function arroftup_to_tupofarr(tx::AbstractArray{<:NTuple{B, <:Number}}, x::AbstractArray{<:Number}) where {B}
-    return ntuple(b -> similar(x) .= getindex.(tx, b), Val(B))
+    return ntuple(b -> similar(x, eltype(eltype(tx))) .= getindex.(tx, b), Val(B))
 end