compare ranges by firstindex before by values (like vectors)

[adienes]

particularly important after #59500 so that ranges match vectors!

[adienes]

the old behavior is explicitly tested for, but I think those tests are incorrect, right?

[jishnub]

This seems to have some overlap with #30950, although it's much smaller in scope. I fear this will be complicated and might be breaking. The axis of an axis is often ignored -- incorrectly -- but that behavior is ancient.

[adienes]

note the following consequence:

julia> using OffsetArrays

julia> a1 = OffsetArray(Int[], 4);

julia> a2 = OffsetArray(Int[], 5);

julia> a1 == a2, axes(a1) == axes(a2)
(true, true)

julia> cmp(a1, a2), cmp(axes(a1), axes(a2))
(-1, -1)

ancient or not, shouldn't we fix it?

[jishnub]

Please go ahead by all means, I'm not vetoing this. I'll just be interested in a PkgEval run to see if this impacts the ecosystem.

[adienes]

@nanosoldier runtests()