[Flow] names of interfaces

[Martin Kutschker]

Hi!

Is it still considered a requirement to use "Interface" as suffix for 
names of interfaces? And if so does this also apply to packages like Surf?

Background: IMHO the abstract class Task in Surf should be turned into 
an interface. It has only three abstract methods and nothing else. If I 
write a patch I want to avoid having to rewrite it just for changing the 
name.

Masi