sort assumes that < returns a boolean

[StefanKarpinski]

julia> v = [ [i,j] | i=1:5, j=1 ]
5x1 Array{Int64,1} Array:
 [1, 1]
 [2, 1]
 [3, 1]
 [4, 1]
 [5, 1]

julia> sort(v)
type error: non-boolean (Array{Bool,1}) used in boolean context

[JeffBezanson]

We could have < always return a boolean and use .< for vectorized comparison. Or use all(a<b) in sort.

[StefanKarpinski]

See my email: it's not quite that simple since all(a < b) isn't obviously the right comparison.

[ViralBShah]

This seems to be more like a feature request than a bug to me.

[StefanKarpinski]

It's a bug because sort uses < for comparison assuming that < always returns a boolean, which it doesn't. We should use something else like sortlt or isless. We were working on all of this but kind of got stalled out on that work, which is tricky and slightly annoying.