diff --git a/src/interface.jl b/src/interface.jl
index 90422750..123dadcd 100644
--- a/src/interface.jl
+++ b/src/interface.jl
@@ -10,4 +10,5 @@ end
 staticschema(::Type{T}) where {T<:Tup} = T
 
 createinstance(::Type{T}, args...) where {T} = T(args...)
-createinstance(::Type{T}, args...) where {T<:Union{Tuple, NamedTuple}} = T(args)
+createinstance(::Type{<:Tuple}, args...)  = args
+createinstance(::Type{<:NamedTuple{names}}, args...) where {names} = NamedTuple{names}(args)
diff --git a/src/structarray.jl b/src/structarray.jl
index f9b43c0a..308a94a5 100644
--- a/src/structarray.jl
+++ b/src/structarray.jl
@@ -134,11 +134,13 @@ Base.axes(s::StructArray) = axes(fieldarrays(s)[1])
 Base.axes(s::StructArray{<:Any, <:Any, <:EmptyTup}) = (1:0,)
 
 get_ith(cols::NamedTuple, I...) = get_ith(Tuple(cols), I...)
-function get_ith(cols::NTuple{N, Any}, I...) where N
-    ntuple(N) do i
-        @inbounds res = getfield(cols, i)[I...]
-        return res
+@generated get_ith(cols::NTuple{N, Any}, I...) where N = _get_ith(N)
+function _get_ith(N::Integer)
+    ex = Expr(:tuple)
+    for i=1:N
+        push!(ex.args, :(getfield(cols, $i)[I...]))
     end
+    ex
 end
 
 Base.@propagate_inbounds function Base.getindex(x::StructArray{T, <:Any, <:Any, CartesianIndex{N}}, I::Vararg{Int, N}) where {T, N}