rewording

gradual.tex

@@ -145,8 +145,8 @@ $(\dyn \to \code{number}\vee\code{string}) \land ((\code{number} \land \dyn) \to
 we stated before, this would introduce an unnecessary cast if the function 
 were to be applied to an integer.\footnote{%
 Notice that considering
-$\code{number} \land \dyn\simeq \code{number}$ as in~\cite{siek2016recursive}  is
-not an option here, since it would force us to choose between having
+$\code{number} \land \dyn\simeq \code{number}$ is
+not an option, since it would force us to choose between having
 the gradual guarantee or having, say,
 $\code{number} \land \code{string}$ be more precise than
 $\code{number} \land \dyn$.}%