From 12d2ddd534b2c63db07a7f4565f3144affcdda4a Mon Sep 17 00:00:00 2001
From: Boris De Vos <boris.devos@ugent.be>
Date: Tue, 16 Dec 2025 11:07:16 +0100
Subject: [PATCH 1/3] specify method

---
 src/algorithms/toolbox.jl | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/algorithms/toolbox.jl b/src/algorithms/toolbox.jl
index bf10f06d..65917b1a 100644
--- a/src/algorithms/toolbox.jl
+++ b/src/algorithms/toolbox.jl
@@ -151,7 +151,7 @@ function marek_gap(above::InfiniteMPS; tol_angle = 0.1, kwargs...)
     return marek_gap(spectrum; tol_angle)
 end
 
-function marek_gap(spectrum; tol_angle = 0.1)
+function marek_gap(spectrum::Vector{T}; tol_angle = 0.1) where {T <: Number}
     # Remove 1s from the spectrum
     inds = findall(abs.(spectrum) .< 1 - 1.0e-12)
     length(spectrum) - length(inds) < 2 || @warn "Non-injective mps?"
@@ -187,7 +187,7 @@ function correlation_length(above::InfiniteMPS; kwargs...)
     return 1 / ϵ
 end
 
-function correlation_length(spectrum; kwargs...)
+function correlation_length(spectrum::Vector{T}; kwargs...) where {T <: Number}
     ϵ, = marek_gap(spectrum; kwargs...)
     return 1 / ϵ
 end

From b88c9b2aa7f5b32fbbe634894b43c41dcce997c2 Mon Sep 17 00:00:00 2001
From: Boris De Vos <boris.devos@ugent.be>
Date: Tue, 16 Dec 2025 11:39:39 +0100
Subject: [PATCH 2/3] check spacetype

---
 src/algorithms/toolbox.jl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/algorithms/toolbox.jl b/src/algorithms/toolbox.jl
index 65917b1a..ce74cf16 100644
--- a/src/algorithms/toolbox.jl
+++ b/src/algorithms/toolbox.jl
@@ -94,7 +94,7 @@ function transfer_spectrum(
     init = randomize!(
         similar(
             above.AL[1], left_virtualspace(below, 1),
-            ℂ[typeof(sector)](sector => 1)' * left_virtualspace(above, 1)
+            spacetype(above)(sector => 1)' * left_virtualspace(above, 1)
         )
     )
 

From 50d2c945dcf4ae5cdae33b2f323b6e76115041f6 Mon Sep 17 00:00:00 2001
From: Boris De Vos <boris.devos@ugent.be>
Date: Tue, 16 Dec 2025 13:50:16 +0100
Subject: [PATCH 3/3] be happy with anything that acts like a vector

---
 src/algorithms/toolbox.jl | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/algorithms/toolbox.jl b/src/algorithms/toolbox.jl
index ce74cf16..f309c5b0 100644
--- a/src/algorithms/toolbox.jl
+++ b/src/algorithms/toolbox.jl
@@ -151,7 +151,7 @@ function marek_gap(above::InfiniteMPS; tol_angle = 0.1, kwargs...)
     return marek_gap(spectrum; tol_angle)
 end
 
-function marek_gap(spectrum::Vector{T}; tol_angle = 0.1) where {T <: Number}
+function marek_gap(spectrum::AbstractVector{T}; tol_angle = 0.1) where {T <: Number}
     # Remove 1s from the spectrum
     inds = findall(abs.(spectrum) .< 1 - 1.0e-12)
     length(spectrum) - length(inds) < 2 || @warn "Non-injective mps?"
@@ -187,7 +187,7 @@ function correlation_length(above::InfiniteMPS; kwargs...)
     return 1 / ϵ
 end
 
-function correlation_length(spectrum::Vector{T}; kwargs...) where {T <: Number}
+function correlation_length(spectrum::AbstractVector{T}; kwargs...) where {T <: Number}
     ϵ, = marek_gap(spectrum; kwargs...)
     return 1 / ϵ
 end