`findlocalmaxima` fail to handle repeated peaks

[JiangXL]

julia> findlocalmaxima([1 2 3 2 1])
1-element Vector{CartesianIndex{2}}:
 CartesianIndex(1, 3)

julia> findlocalmaxima([1 2 3 3 1])
CartesianIndex{2}[]

I'm not sure whether it is a bug or I need to handle this case outside findlocalmaxia