>>> MongoClient(ssl=True, tls=False)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/shane/git/mongo-python-driver/pymongo/mongo_client.py", line 672, in __init__
    opts = _handle_security_options(opts)
  File "/Users/shane/git/mongo-python-driver/pymongo/uri_parser.py", line 217, in _handle_security_options
    options.cased_key('ssl'), options.cased_key('tls')))
AttributeError: 'dict' object has no attribute 'cased_key'

>>> MongoClient('mongodb://localhost/?ssl=true&tls=false')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/shane/git/mongo-python-driver/pymongo/mongo_client.py", line 639, in __init__
    res = uri_parser.parse_uri(
  File "/Users/shane/git/mongo-python-driver/pymongo/uri_parser.py", line 466, in parse_uri
    options.update(split_options(opts, validate, warn, normalize))
  File "/Users/shane/git/mongo-python-driver/pymongo/uri_parser.py", line 326, in split_options
    options = _handle_security_options(options)
  File "/Users/shane/git/mongo-python-driver/pymongo/uri_parser.py", line 216, in _handle_security_options
    raise InvalidURI(err_msg % (
pymongo.errors.InvalidURI: Can not specify conflicting values for URI options ssl and tls.