Float(Dual(x,y)) == Dual(Float(x), Float(y))

Author: oxinabox

src/dual.jl

@@ -315,7 +315,7 @@ end
 end
 
 for F in (:Float16, :Float32, :Float64)
-    @eval @inline Base.$F(d::Dual) = $F(value(d))
+    @eval @inline Base.$F(d::Dual{T,V,N}) where {T,V,N} = convert(Dual{T,promote_type(V, $F),N}, d)
 end
 
 @inline Random.rand(rng::AbstractRNG, d::Dual) = rand(rng, value(d))

test/DualTest.jl

@@ -519,9 +519,8 @@ end
 end
 
 @testset "Float" begin
-    x = Dual(1.0, 0)
     for F in (Float16, Float32, Float64)
-        @test F(1.0) == F(x)
+        @test F(Dual(3, 5)) == Dual(F(3), F(5))
     end
 end