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-rw-r--r--src/runtime.js1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/runtime.js b/src/runtime.js
index 9b52bbe4..5e3dcdcc 100644
--- a/src/runtime.js
+++ b/src/runtime.js
@@ -322,6 +322,7 @@ var Runtime = {
prettyPrint: function(arg) {
if (typeof arg == 'undefined') return '!UNDEFINED!';
+ if (typeof arg == 'boolean') arg = arg + 0;
if (!arg) return arg;
var index = Runtime.printObjectList.indexOf(arg);
if (index >= 0) return '<' + arg + '|' + index + '>';