Inconsistency between accepted argument types for YCbCr constructor and colorview

There seem to be some inconsistencies in the accepted argument-types to the YCbCr constructor and the element-types of the channels in colorview.

Here, all the following types work:

using ImageCore
types = (UInt8, Int, N0f8, Float32)

for T in types
    YCbCr(rand(T, 3)...)
end

While here, only the Float32 does:

for T in types
    try
        colorview(YCbCr, (rand(T, 10, 10) for _ in 1:3)...)
        @info "worked for type $T"
    catch ex
        if ex isa TypeError
            @warn "failed for type $T"
        else
            throw(ex)
        end
    end
end

Start by running the two Julia reproductions from the issue and inspect the YCbCr constructor and colorview implementations in ImageCore.jl. The work is done when the accepted argument types and channel element types are consistent for the listed types, with regression coverage for the demonstrated cases.