• introduced workaround to SvPVbyte bug in Perl 5.6
  -- module behavior now consistent under all Perls 5.6+
  -- ref: new test script t/unicode.t
  -- SHA routines now always croak on wide chars (5.6+)
  
• removed "static" message schedules from C code
  -- default "auto" is now just as fast
  -- thread-safe option (-t) no longer necessary
  -- still allowed, but ignored
  -- simplifies source and header files
  -- eliminates SHA_STO_CLASS and SHA_THREAD_SAFE
  -- ref. Bug #82784
  -- thanks to Steve Hay for initial patch
  
• provided documentation to describe Unicode handling
  -- ref: Bug #82378
  
• updated documentation of NIST statement on SHA-1