Bug #52778 for Unicode-Stringprep: use bytes

The use bytes version of U::S is significantly slower: tmon_bytes.out: Total Elapsed Time = 26.60081 Seconds User+System Time = 22.13398 Seconds Exclusive Times %Time ExclSec CumulS #Calls sec/call Csec/c Name 108. 23.90 28.658 740006 0.0000 0.0000 Unicode::Stringprep::__ANON__ 8.07 1.786 1.786 450000 0.0000 0.0000 Unicode::Stringprep::_check_malformed 6.30 1.394 1.394 450000 0.0000 0.0000 Unicode::Normalize::NFKC 5.34 1.183 1.183 550000 0.0000 0.0000 Unicode::Stringprep::_u8_ord 1.25 0.276 0.276 710000 0.0000 0.0000 utf8::decode 0.50 0.110 0.110 900000 0.0000 0.0000 utf8::encode 0.09 0.019 0.023 3 0.0064 0.0078 Unicode::Stringprep::_Common::_mk_map 0.06 0.013 0.052 1 0.0131 0.0519 Unicode::Stringprep::_compile tmon_utf8.out: Total Elapsed Time = 5.643093 Seconds User+System Time = 5.589600 Seconds Exclusive Times %Time ExclSec CumulS #Calls sec/call Csec/c Name 81.6 4.563 5.886 450000 0.0000 0.0000 Unicode::Stringprep::__ANON__ 23.4 1.312 1.312 450000 0.0000 0.0000 Unicode::Normalize::NFKC 0.34 0.019 0.023 3 0.0063 0.0078 Unicode::Stringprep::_Common::_mk_map 0.21 0.012 0.024 1 0.0120 0.0243 Unicode::Stringprep::_compile 0.13 0.007 0.038 11 0.0006 0.0034 Unicode::Stringprep::BEGIN 0.13 0.007 0.007 511 0.0000 0.0000 Unicode::Stringprep::_compile_mapping_r 0.11 0.006 0.006 1 0.0062 0.0062 utf8::AUTOLOAD 0.07 0.004 0.004 2518 0.0000 0.0000 Unicode::Stringprep::_Common::__ANON__