And a quick followup to Michael:

I didn't want to pollute the comments 
in 
https://bitbucket.org/zzzeek/sqlalchemy/issues/3225/query-heuristic-inspection-system
 
as there may not have been any substantial changes and I'm just reviewing 
my old notes wrong...

How long do you think it is safe to inspect query attributes like:

* `query._with_options`
* `query._entities`

Reviewing some of my old notes, it looks like these used to work:

* `query.__dict__.get('with_options')` 
* `query.__dict__.get('entities')` 

but they've been replaced at some point with a leading underscore, and a 
corresponding attribute.

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