Request for warnings on implicit bool to int conversions

[Gabriel Dos Reis]

> Hi,
>>
>> It would be nice if there was a
>>
>>  -Wimplicit_bool
>>
>> that was enabled in -Wall which complained about these sorts of
>> operations.  In particular
>> it would warn any time a bool was implicitly promoted to an int.
>

I am trying to understand what the real issue is here.  Do you want
-Wimplicit-char-to-int to?  -Wimplicit-short-to-int?  If not, why?
where to stop?