diff --git a/src/interface/generic/cast.jl b/src/interface/generic/cast.jl
index 5f73b28a..b0005262 100644
--- a/src/interface/generic/cast.jl
+++ b/src/interface/generic/cast.jl
@@ -121,7 +121,7 @@ end
 function cast(
     sense_route::Pair{A,B},
     domain_route::Pair{X,Y},
-    data,
+    data...,
 ) where {A<:Sense,B<:Sense,X<:Domain,Y<:Domain}
-    return cast(sense_route, cast(domain_route, data))
+    return cast(sense_route, cast(domain_route, data...)...)
 end
diff --git a/src/library/sampleset.jl b/src/library/sampleset.jl
index 7fe93f14..5c936b31 100644
--- a/src/library/sampleset.jl
+++ b/src/library/sampleset.jl
@@ -1,9 +1,8 @@
-function cast(::Pair{D,D}, ψ::Vector{U}) where {U<:Integer,D<:Domain}
-    return copy(ψ)
-end
+cast(::Pair{D,D}, x::Integer) where {D<:Domain} = x
+cast(::Pair{BoolDomain,SpinDomain}, x::Integer) = (2 * x) - 1
+cast(::Pair{SpinDomain,BoolDomain}, s::Integer) = (s + 1) ÷ 2
 
-cast(::Pair{BoolDomain,SpinDomain}, x::Integer)                      = (2 * x) - 1
-cast(::Pair{SpinDomain,BoolDomain}, s::Integer)                      = (s + 1) ÷ 2
+cast(::Pair{D,D}, ψ::Vector{U}) where {U<:Integer,D<:Domain}         = copy(ψ)
 cast(::Pair{BoolDomain,SpinDomain}, ψ::Vector{U}) where {U<:Integer} = (2 .* ψ) .- 1
 cast(::Pair{SpinDomain,BoolDomain}, ψ::Vector{U}) where {U<:Integer} = (ψ .+ 1) .÷ 2
 
@@ -221,6 +220,10 @@ It was inspired by [^dwave], with a few tweaks.
         return new{T,U}(data, metadata)
     end
 
+    function SampleSet{T,U}(metadata::Dict{String,Any}) where {T,U}
+        return new{T,U}(Sample{T,U}[], metadata)
+    end
+
     function SampleSet{T,U}() where {T,U}
         return new{T,U}(Sample{T,U}[], Dict{String,Any}())
     end