R. David Murray added the comment:

is_multipart is *not* part of the provisional API, though; only is_attachment 
is.

So per my understanding of the provisional rules, we should either make 
is_attachment a method in both 3.4 maint and 3.5, or make is_multipart emit a 
deprecation warning in 3.5.  

I lean toward the former for backward compatibility reasons, with Serhiy's 
addition of making it emit a warning if not called in 3.4.

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