`empty(v::OffsetVector)` returns a `Vector`

The Julia documentation says that empty(v::AbstractVector) returns "an empty vector similar to v". Currently similar preserves indices for OffsetVector,

julia> v = OffsetVector([1,2], 0:1)
2-element OffsetArray(::Vector{Int64}, 0:1) with eltype Int64 with indices 0:1:
 1
 2

julia> similar(v)
2-element OffsetArray(::Vector{Int64}, 0:1) with eltype Int64 with indices 0:1:
 139997918114896
 139997785055648

but empty does not because it returns a Vector:

julia> empty(v)
Int64[]

Since empty reduces the length of the vector to zero, one can at most preserve either the first or the last index. Assuming that 0-based vectors are the most common use case for OffsetVector, I think it would make sense to preserve the first index in general.

Start by locating the OffsetVector implementations or methods for empty(v) and similar(v), then inspect any existing tests covering these operations. Reproduce the examples from the issue and verify that the completed change preserves the first index while returning an empty OffsetVector rather than a Vector.