dtest: user_functions_test.py:TestUserFunctions.udf_scripting_test fails

ERROR: udf_scripting_test (user_functions_test.TestUserFunctions)
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Traceback (most recent call last):
  File "c:\src\cassandra-dtest\user_functions_test.py", line 169, in udf_scripting_test
    assert_invalid(session, "select y_sin(val) from nums where key = 1")
  File "c:\src\cassandra-dtest\assertions.py", line 23, in assert_invalid
    res = session.execute(query)
  File "C:\Python27\lib\site-packages\cassandra\cluster.py", line 1615, in execute
    result = future.result(timeout)
  File "C:\Python27\lib\site-packages\cassandra\cluster.py", line 3154, in result
    raise self._final_exception
FunctionFailure: code=1400 [User Defined Function failure] message="execution of 'ks.y_sin[double]' failed: com.datastax.driver.core.exceptions.InvalidTypeException: Invalid value for CQL type double, expecting class java.lang.Double but class java.lang.String provided"