Add:

< * -Eventually enable escape_string_warning and standard_conforming_strings
> * -Enable escape_string_warning and standard_conforming_strings
> * Make standard_conforming_strings the default in 8.3?
>
>   When this is done, backslash-quote should be prohibited in non-E''
>   strings because of possible confusion over how such strings treat
>   backslashes.  Basically, '' is always safe for a literal single
>   quote, while \' might or might not be based on the backslash
>   handling rules.
>