[julia-users] diff return type

[i . costigan]

Would someone be able to explain why `diff()` returns Any when its input is 
a vector of `Real` values but returns Float64 when its input is a vector of 
`Float64` values?

julia> diff(Real[1., 2.])

1-element Array{Any,1}:

 1.0

vs

julia> diff(Float64[1,2])

1-element Array{Float64,1}:

 1.0


julia> versioninfo()

Julia Version 0.3.3

Commit b24213b* (2014-11-23 20:19 UTC)

Platform Info:

  System: Darwin (x86_64-apple-darwin14.1.0)

  CPU: Intel(R) Core(TM) i5-4260U CPU @ 1.40GHz

  WORD_SIZE: 64

  BLAS: libopenblas (DYNAMIC_ARCH NO_AFFINITY Haswell)

  LAPACK: libopenblas

  LIBM: libopenlibm

  LLVM: libLLVM-3.3

Thanks