Strange automagic kernel centering depending on eltype

[jw3126]

using ImageFiltering

@assert imfilter(       [0, 0, 1, 0, 0], [1, 1]) == [  1, 1  ,   0, 0  , 0]
@assert imfilter(Float64[0, 0, 1, 0, 0], [1, 1])  ≈ [0.0, 1.0, 1.0, 0.0, 0.0]

[jw3126]

Digging a bit into the implementation, it almost looks like the magic kernel centering is intended and the bug is that in the Int case there is no such centering?

ImageFiltering.jl/src/imfilter.jl

Line 10 in 47fae0a

imfilter(T, img, factorkernel(kernel), args...)

ImageFiltering.jl/src/imfilter.jl

Line 1503 in 47fae0a

factorkernel(kernel::AbstractArray) = (kernelshift(axes(kernel), kernel),)

OTOH my impression was, that a design principle of this package is to avoid magic like implicit kernel centering?

[jw3126]

If somebody can clarify I can make a PR to document the intended behavior and fix the unintended behavior.