Result event triggered through ItemResponder and CallResponder is executed twice

Steps to reproduce:
1. Create application with HTTPService and either CallResponder or ItemResponder that defines a result handler function
2. Add a trace to the result handler
3. Run and execute HTTPService send() method

Actual Results:
The result handler is executed twice

Expected Results:
The result handler should only be executed once

Workaround (if any):
Add flags to the result handler method to ensure that any data handling code is executed only once.

Similar code in Flex 3.4 behaves correctly - event handler is executed only once.
See attached applications and data file for demo.