js> load('testsrc/doctests/util.js')

js> var bom = String.fromCharCode(0xFEFF);
js> eval(bom);
js> var _ = eval("(function(){return"+bom+"1;})");
js> expectError(function() {
  >   eval("i"+bom+"f (false);");
  > }, SyntaxError);

js> parseInt(bom+"1")
1
js> parseFloat(bom+"1.5");
1.5
js> (bom+"abc"+bom).trim().length
3
js> /\s/.test(bom)
true
js> (bom+"1"+bom) * 1
1