I don't really understand how it works internally, so wondering if it's 
safe to rely on a value stored as a session storage variable. 
More specifically, I am authorizing one user to do certain actions on 
behalf of another user, and the currently assumed user is stored in 
session.user (even if auth.user_id is somebody else). 
If somebody can hack session and change the value of session.user - it 
would be potentially dangerous situation, so if it's not safe - I would 
have to figure out something else.It's just easy and tempting to use some 
variables in a session. 
Any ideas on how safe it is? 

p.s. I don't care if somebody can read it - my only concern is that they 
shouldn't be able to overwrite it, because this would give them authority 
to perform certain actions.

-- 
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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