1 files changed, 4 insertions, 0 deletions
diff --git a/lib/js/urweb.js b/lib/js/urweb.js
index ef2c7b49..251f64ba 100644
--- a/lib/js/urweb.js
+++ b/lib/js/urweb.js
@@ -471,6 +471,10 @@ function uu(s) {
   return unescape(s.replace(new RegExp ("\\+", "g"), " "));
 }
 
+function ub(b) {
+  return b ? "1" : "0";
+}
+
 function uul(getToken, getData) {
   var tok = getToken();
   if (tok == "Nil") {