Only constrain TR if it is not already set to a number

src/sequences.jl

@@ -28,11 +28,7 @@ struct Sequence <: ContainerBlock
             to_block.(blocks),
             get_free_variable(TR),
         )
-        if TR isa Number
-            if !isinf(TR)
-                @assert seq.TR >= duration(seq)
-            end
-        else
+        if !(TR isa Number)
             @constraint global_model() seq.TR >= duration(seq)
         end
         return seq