what is the encoding of Zval IS_STRING for string literals when unicode.semantics=off

Hello,

When the unicode.semantics=off, in what encoding will the PHP 6 engine 
create Zval IS_STRING for the string literals?
I can think of two possibilities.

1. PHP 6 does the same as PHP 5 because unicode.semantics=off means 
backwards compatibility. Thus they are binary data.
2. PHP 6 respects the unicode.script_encoding (or the encoding pragma) 
and the unicode.runtime_encoding. Thus they are in 
unicode.runtime_encoding.

Thank you,
Makoto