add Base.Order.lt specialization for Perm{<:Any,<:StaticVector}

Author: stev47

src/sort.jl

@@ -36,6 +36,8 @@ end
     return SVector{length(a),Int}(_sort(p, alg, ordr))
 end
 
+@inline @propagate_inbounds Base.Order.lt(p::Perm{<:Base.Order.Ordering,<:StaticVector}, a::Integer, b::Integer) =
+    lt(p.order, (p.data[a], a), (p.data[b], b))
 
 @inline _sort(a::StaticVector, alg, order) =
     similar_type(a)(sort!(Base.copymutable(a); alg=alg, order=order))