`Base.axes1(Base.Slice(blockedrange([2, 3])))` returns `Base.IdentityUnitRange`

[mtfishman]

julia> Base.axes1(Base.Slice(blockedrange([2, 3])))
Base.IdentityUnitRange(BlockedOneTo([2, 5]))

while ideally it would return blockedrange([2, 3]), analogous to this definition for axes:

BlockArrays.jl/src/blockaxis.jl

Line 680 in d55d96e

Base.axes(S::Base.Slice{<:BlockedOneTo}) = (S.indices,)

.