cache(Zeros(n, n)) == cache(Zeros(n, n)) uses matrix ==

[DanielVandH]

julia> using LazyArrays, FillArrays

julia> @which cache(Zeros(5)) == cache(Zeros(5)) # good
==(A::LazyArrays.CachedArray{<:Any, 1, <:Any, <:Zeros}, B::LazyArrays.CachedArray{<:Any, 1, <:Any, <:Zeros})
     @ LazyArrays C:\Users\djv23\.julia\packages\LazyArrays\44w6E\src\padded.jl:121

julia> @which cache(Zeros(5, 5)) == cache(Zeros(5, 5)) # fallback
==(A::AbstractArray, B::AbstractArray)
     @ Base abstractarray.jl:2937

Would be good to have them both be a specialised definition to make it easier to do == being Zeros-backed caches. Will make a pr