> Just add a "strict" flag, make
> it false by default, and raise an error if there is any unparsable
> extra data.

If the module does not actually checks the correctness of all
(including local file headers, which now it ignores), it will be a false
promise. And I don't understand who these checks are needed at all.

Note that the parameter "strict" in htmlparser is considered to be
obsolete.