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julia> mapc(*, x, y)
ERROR: MethodError: no method matching _same_colorspace(::Float64, ::Float64)
Stacktrace:
[1] mapc(::typeof(*), ::Float64, ::Float64) at /Users/jc/.julia/packages/ColorTypes/GHtY7/src/operations.jl:107
[2] top-level scope at REPL[4]:1
julia> mapc(*, Gray(x), Gray(y))
Gray{Float64}(0.013853760001569756)I believe this helps unify how we process AbstractArray{<:AbstractGray} and AbstractArray{<:Number}.
We basically only need to define mapc(op, x::Number, y::Number) = op(x, y)