Integer input not accepted

[jrfiedler]

The loess function doesn't accept integer input:

julia> using Loess

julia> x = [1, 2, 3, 4];

julia> y = [1.0, 2.0, 3.0, 4.0];

julia> model = loess(x, y, span = 0.33);
ERROR: MethodError: no method matching loess(::Array{Int64,1}, ::Array{Float64,1}; span=0.25)
Closest candidates are:
  loess(::AbstractArray{T<:AbstractFloat,2}, ::AbstractArray{T<:AbstractFloat,1}; normalize, span, degree) where T<:AbstractFloat at /home/jf/.julia/packages/Loess/TaYdb/src/Loess.jl:42
  loess(::AbstractArray{T<:AbstractFloat,1}, ::AbstractArray{T<:AbstractFloat,1}; normalize, span, degree) where T<:AbstractFloat at /home/jf/.julia/packages/Loess/TaYdb/src/Loess.jl:110
Stacktrace:
 [1] top-level scope at none:0

The error goes away if x is float.