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## Inferring flags ##
The whole reason for the has_netloc etc flags is that I don’t think we can always infer their values, so we have to explicitly remember them. Consider the following two URLs, which I think should both have empty "netloc" strings for backwards compatibility, but should be handled differently by urlunsplit():
>>> urlsplit("////evil.com").netloc
''
>>> urlsplit("////evil.com").has_netloc
True
>>> urlunsplit(urlsplit("////evil.com")) # Adds "//" back
'////evil.com'
>>> urlsplit("/normal/path").netloc
''
>>> urlsplit("/normal/path").has_netloc
False
>>> urlunsplit(urlsplit("/normal/path")) # Does not add "//"
'/normal/path'
## _NetlocResultMixinBase abuse ##
The _NetlocResultMixinBase class is a common class used by the four result classes I’m interested in. I probably should rename it to something like _SplitParseMixinBase, since it is the common base to both urlsplit() and urlparse() results.