Fix encode() behavior when called with falsy arguments. Resolves inexorabletash#58

Author: inexorabletash

lib/encoding.js

@@ -1268,7 +1268,7 @@ if (typeof module !== "undefined" && module.exports) {
    * @return {!Uint8Array} Encoded bytes, as a Uint8Array.
    */
   TextEncoder.prototype.encode = function encode(opt_string, options) {
-    opt_string = opt_string ? String(opt_string) : '';
+    opt_string = opt_string === undefined ? '' : String(opt_string);
     options = ToDictionary(options);
 
     // NOTE: This option is nonstandard. None of the encodings

test/test-misc.js

@@ -379,3 +379,9 @@ test(function() {
 
   }, 'NONSTANDARD - ' + encoding + ' (encoding)');
 });
+
+test(function() {
+  var encoder = new TextEncoder();
+  assert_array_equals([].slice.call(encoder.encode(false)), [102, 97, 108, 115, 101]);
+  assert_array_equals([].slice.call(encoder.encode(0)), [48]);
+}, 'encode() called with falsy arguments (polyfill bindings)');