gistfile1.as

var dict = new Dictionary;
dict[runTests] = true;
var isFirstRun = true;
for (var key in dict) {
trace('key = ' + key);
  if (isFirstRun) {
		dict[this] = true;
		isFirstRun = false;
	}
	delete dict[key];
}
trace("dict[this] = " + dict[this]);
trace("dict[runTests] = " + dict[runTests]);

trace('======');

var dict = new Dictionary;
dict[this] = true;
var isFirstRun = true;
for (var key in dict) {
trace('key = ' + key);
	if (isFirstRun) {
		dict[runTests] = true;
		isFirstRun = false;
	}
	delete dict[key];
}
trace("dict[this] = " + dict[this]);
trace("dict[runTests] = " + dict[runTests]);

/* outputs

key = function Function() {}
dict[this] = true
dict[runTests] = undefined
======
key = [object DictionaryTests]
key = function Function() {}
dict[this] = undefined
dict[runTests] = undefined

*/