hi
just an idea: is it possible to have half-baked backref-declarations?

i want to use the SA's way of inventing backrefs from a name, and just 
provide some extra arguments to that invention.

instead now i have a full backref(...) having more or less all of the 
relation(...) arguments, but with additional logic on 
picking/swapping of primaryjoin/secondaryjoin - something that SA 
does internaly in the PropertyLoader constructor.

alternatively, i can patch the backref later, letting SA invent it 
properly and then fix some things - like post_update and remote_side. 
how bad is that?

btw remote_side is not propagated by PropertyLoader constructor - but 
IMO is needed.

ciao
svilen

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