BooleanField doesn't always clean to False when required=True

[David Reynolds]

In the documentation it says:

Validates that the check box is checked (i.e. the value is True) if the field has required=True.

However, this isn't the case. I've seen it show up in cleaned_data as None and False at different times (in the same form) and also no error is generated for it.

[Karen Tracey <kmtracey@…>]

Not raising an error is a dup of #5957. Getting returned as None doesn't sound right, if you've got a testcase that reliably shows that behavior please provide more details.