1 files changed, 2 insertions, 0 deletions
diff --git a/lib/js/urweb.js b/lib/js/urweb.js
index 342dc943..df9097b1 100644
--- a/lib/js/urweb.js
+++ b/lib/js/urweb.js
@@ -1261,6 +1261,8 @@ function eh(x) {
 
 function ts(x) { return x.toString() }
 function bs(b) { return (b ? "True" : "False") }
+function s2b(s) { return s == "True" ? true : s == "False" ? false : null; }
+function s2be(s) { return s == "True" ? true : s == "False" ? false : er("Illegal Boolean " ^ s); }
 
 function id(x) { return x; }
 function sub(s, i) { return s.charAt(i); }