Use uninitialized for uninitialized array construction

Author: martinholters

src/definitions.jl

@@ -36,7 +36,7 @@ realfloat(x::AbstractArray{T}) where {T<:Real} = copy1(typeof(fftfloat(zero(T)))
 
 # copy to a 1-based array, using circular permutation
 function copy1(::Type{T}, x) where T
-    y = Array{T}(map(length, Compat.axes(x)))
+    y = Array{T}(uninitialized, map(length, Compat.axes(x)))
     Base.circcopy!(y, x)
 end