diff --git a/src/utils/array_utils.jl b/src/utils/array_utils.jl
index 082e7524f..c70f661a9 100644
--- a/src/utils/array_utils.jl
+++ b/src/utils/array_utils.jl
@@ -45,10 +45,14 @@ const SingleArrayIndex = Union{Integer, CartesianIndex}
 
 convert_numtype(::Type{T}, x::T) where {T<:Real} = x
 convert_numtype(::Type{T}, x::Real) where {T<:Real} = convert(T, x)
+convert_numtype(::Type{T}, x::Integer) where {T<:AbstractFloat} = x
 
 convert_numtype(::Type{T}, x::AbstractArray{T}) where {T<:Real} = x
 convert_numtype(::Type{T}, x::AbstractArray{<:Real}) where {T<:Real} = convert.(T, x)
 
+convert_numtype(::Type{T}, x::Tuple) where {T<:Real} = map(Base.Fix1(convert_numtype, T), x)
+convert_numtype(::Type{T}, x::NamedTuple{names}) where {T<:Real, names} = NamedTuple{names}(convert_numtype(T, values(x)))
+
 convert_numtype(::Type{T}, x::ArrayOfSimilarArrays{T}) where {T<:Real} = x
 convert_numtype(::Type{T}, x::ArrayOfSimilarArrays{<:Real,M,N}) where {T<:Real,M,N} =
     ArrayOfSimilarArrays{T,M,N}(convert_numtype(T, flatview(x)))