[Twisted-Python] Are t.w.s.Requests's prepath/postpath part of the IRequest interface?

[Wim Lewis]

I was just working on the documentation to fix Trac bug #5533, but I 
have a question about intent. Right now, prepath and postpath are 
undocumented; as best as I can tell, though, they are intended to be 
public. Question is, are they part of the IRequest interface, or only of 
the Request implementation?

(There aren't any other implementations of IRequest in Twisted, so I 
suppose it's a little bit academic.)

It seems to me that they should be on IRequest, since IRequest already 
has methods like prePathURL() which depend on the information in 
prepath/postpath. Leaving these attributes off of IRequest wouldn't 
provide any more flexibility to implementers of the interface, and 
postpath in particular is very useful to people writing render methods.

 <https://twistedmatrix.com/trac/ticket/5533>