1:3 != collect(1:3)

[nalimilan]

Is the fact that 1:3 != collect(1:3) intended? I can see in the definition of == that comparisons between Range and Array are explicitly handled to return false, but I can't find a good reason for that.

julia> x = 1:3
1:3

julia> y = collect(x)
3-element Array{Int64,1}:
 1
 2
 3

julia> x == y
false

# And yet:
julia> all(Bool[i == j for (i, j) in zip(x, y)])
true

help?> ==
[...]
  Collections should generally implement == by calling == recursively on all
  contents.
[...]

[simonster]

Yes, ranges are not equal to non-ranges because otherwise hashing a range would require hashing every element, which could take quite a while.

[simonster]

See also #5778 (comment), #6084, #12226

[nalimilan]

Ah, thanks, not sure how I forgot these discussions. Looks like the two most recent comments at #12226 (comment) point to a possible solution.