charsets and ecodings - ascii fallback
charsets and ecodings - ascii fallback

* string operations with mixed ascci + utf8 strings fallback to
  ascii, if the utf8 string is just ascii


git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@9979 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot