[julia-users] calling sort on a range with rev=true

['Greg Plowman' via julia-users]

There have been discussions about whether a range can substitute in most 
cases where a vector is required.

julia> sort(1:3)
1:3

julia> sort(1:3, rev=true)
ERROR: indexed assignment not defined for UnitRange{Int64}
 in sort! at sort.jl:222
 in sort! at sort.jl:292
 in sort! at sort.jl:402
 in sort at sort.jl:413

julia> sort(collect(1:3), rev=true)
3-element Array{Int64,1}:
 3
 2
 1



I guess it's unclear whether sort(1:3, rev=true) should return 3:-1:1 or 
[3,2,1] or be an error as it currently is.

Any thoughts?