Allow passing iterators where collections are expected (#3078)
Iterators can only be enumerated once, breaking code like this in
Python 3 for example:
san = SubjectAlternativeName(map(DNSName, lst))
This is also a slight behavior change if the caller modifies the list
after passing it to the constructor, because input lists are now copied.
Which seems like a good thing.
Also:
* Name now checks that attributes elements are of type NameAttribute
* NoticeReference now allows notice_numbers to be any iterable4 files changed