diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 2707c2c..89056d4 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -22,8 +22,8 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - '1.10' # replace with LTS once it is released
-          # - '1' # automatically expands to the latest stable 1.x release of Julia
+          - 'lts' # current lts release
+          - '1' # latest stable release
         os:
           - ubuntu-latest
           - macOS-latest
diff --git a/Project.toml b/Project.toml
index b63c0b5..9798193 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "TensorKitSectors"
 uuid = "13a9c161-d5da-41f0-bcbd-e1a08ae0647f"
 authors = ["Lukas Devos", "Jutho Haegeman"]
-version = "0.1.0"
+version = "0.1.1"
 
 [deps]
 HalfIntegers = "f0d1745a-41c9-11e9-1dd9-e5d34d218721"
diff --git a/src/auxiliary.jl b/src/auxiliary.jl
index 3ea734c..b7ba403 100644
--- a/src/auxiliary.jl
+++ b/src/auxiliary.jl
@@ -31,7 +31,7 @@ end
 end
 
 @inline localoffset(d, I::Tuple{Int}, sz::Tuple{Int}) = 0
-@inline function localoffset(d, I, sz)
+@inline function localoffset(d, I::NTuple{N,Int}, sz::NTuple{N,Int}) where {N}
     offset = 0
     for i in 1:(I[1] - 1)
         offset += num_manhattan_points(d - i + 1, Base.tail(sz))
@@ -55,7 +55,7 @@ end
 
 # inverse mapping
 @inline invertlocaloffset(d, offset, sz::Tuple{Int}) = (d + 1,)
-@inline function invertlocaloffset(d, offset, sz)
+@inline function invertlocaloffset(d, offset, sz::Tuple{Int,Int,Vararg{Int}})
     i₁ = 1
     while i₁ < sz[1]
         jump = num_manhattan_points(d - i₁ + 1, Base.tail(sz))
diff --git a/src/irreps.jl b/src/irreps.jl
index e0096a8..9fef576 100644
--- a/src/irreps.jl
+++ b/src/irreps.jl
@@ -135,7 +135,7 @@ Base.conj(c::U1Irrep) = U1Irrep(-c.charge)
 ⊗(c1::U1Irrep, c2::U1Irrep) = (U1Irrep(c1.charge + c2.charge),)
 
 Base.IteratorSize(::Type{SectorValues{U1Irrep}}) = IsInfinite()
-function Base.iterate(::SectorValues{U1Irrep}, i=0)
+function Base.iterate(::SectorValues{U1Irrep}, i::Int=0)
     return i <= 0 ? (U1Irrep(half(i)), (-i + 1)) : (U1Irrep(half(i)), -i)
 end
 function Base.getindex(::SectorValues{U1Irrep}, i::Int)
@@ -188,7 +188,7 @@ Base.conj(s::SU2Irrep) = s
 ⊗(s1::SU2Irrep, s2::SU2Irrep) = SectorSet{SU2Irrep}(abs(s1.j - s2.j):(s1.j + s2.j))
 
 Base.IteratorSize(::Type{SectorValues{SU2Irrep}}) = IsInfinite()
-Base.iterate(::SectorValues{SU2Irrep}, i=0) = (SU2Irrep(half(i)), i + 1)
+Base.iterate(::SectorValues{SU2Irrep}, i::Int=0) = (SU2Irrep(half(i)), i + 1)
 function Base.getindex(::SectorValues{SU2Irrep}, i::Int)
     return 1 <= i ? SU2Irrep(half(i - 1)) : throw(BoundsError(values(SU2Irrep), i))
 end
@@ -269,7 +269,7 @@ Base.getindex(::IrrepTable, ::Type{CU₁}) = CU1Irrep
 Base.convert(::Type{CU1Irrep}, (j, s)::Tuple{Real,Integer}) = CU1Irrep(j, s)
 
 Base.IteratorSize(::Type{SectorValues{CU1Irrep}}) = IsInfinite()
-function Base.iterate(::SectorValues{CU1Irrep}, state=(0, 0))
+function Base.iterate(::SectorValues{CU1Irrep}, state::Tuple{Int,Int}=(0, 0))
     j, s = state
     if iszero(j) && s == 0
         return CU1Irrep(j, s), (j, 1)
diff --git a/src/product.jl b/src/product.jl
index a98d772..5dab33a 100644
--- a/src/product.jl
+++ b/src/product.jl
@@ -166,8 +166,14 @@ dim(p::ProductSector) = *(dim.(p.sectors)...)
 
 Base.isequal(p1::ProductSector, p2::ProductSector) = isequal(p1.sectors, p2.sectors)
 Base.hash(p::ProductSector, h::UInt) = hash(p.sectors, h)
-function Base.isless(p1::P, p2::P) where {P<:ProductSector}
-    return isless(findindex(values(P), p1), findindex(values(P), p2))
+function Base.isless(p1::ProductSector{T}, p2::ProductSector{T}) where {T<:SectorTuple}
+    I1 = findindex.(values.(_sectors(T)), p1.sectors)
+    I2 = findindex.(values.(_sectors(T)), p2.sectors)
+    d1 = sum(I1) - length(I1)
+    d2 = sum(I2) - length(I2)
+    d1 < d2 && return true
+    d1 > d2 && return false
+    return isless(I1, I2)
 end
 
 # Default construction from tensor product of sectors