ranges: compare lengths in == for zero-step StepRangeLen (#64450)

Co-authored-by: Miles Cranmer <miles.cranmer@gmail.com>

Author: MilesCranmerBot

base/range.jl

@@ -1171,6 +1171,7 @@ end
 function ==(r::Union{StepRange{T},StepRangeLen{T,T}}, s::Union{StepRange{T},StepRangeLen{T,T}}) where {T}
     isempty(r) && return isempty(s)
     _has_length_one(r) && return _has_length_one(s) & (first(r) == first(s))
+    iszero(step(r)) && return iszero(step(s)) && (first(r) == first(s)) && (length(r) == length(s))
     (first(r) == first(s)) & (step(r) == step(s)) & (last(r) == last(s))
 end
 

test/ranges.jl

@@ -1147,7 +1147,7 @@ end
                        range(0, stop=1, length=20), map(Float32, range(0, stop=1, length=20)),
                        3:2, 5:-2:7, range(0.0, step=2.0, length=0), 3//2:3//2:0//1, LinRange(2,3,0),
                        Base.OneTo(1), 1:1, 1:-3:1, 1//1:1//3:1//1, range(1.0, step=2.5, length=1),
-                       LinRange(1,1,1), LinRange(1,1,2)]
+                       LinRange(1,1,1), LinRange(1,1,2), StepRangeLen(1, 0, 2), StepRangeLen(1, 0, 3)]
     for r in Rs
         local r
         ar = Vector(r)