> I gues my question is, can users safely rely on _<something> methods? 
>

The change revert is due this concern about api reliability, so adapters 
behave as specified in

http://www.web2py.com/books/default/chapter/29/06/the-database-abstraction-layer?search=_insert#Raw-SQL

What is w2p's "policy" regarding underscore-prefixed functions.
> Are they considered private?
>

Underscore is required in some cases for example to avoid name collisions. 
I suppose that the policy about the use of underscore follows the pep8 
style guide except for special cases described in the book. For example 
(chapter 4):

Functions that take arguments or start with a double underscore are not 
> publicly exposed and can only be called by other functions.


So can I use the above function as it is?
>

I think so 

> What do you mean by  "temporarily"?
> Could the feature be implemented in the future with a different name?

It could, If there's agreement about adding it to the adapter.

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