• Add : You can use a function name as a callback by passing a string
  reference to wizard() instead of a code reference.
  
• Fix : Compatiblity with perl 5.11.1 and 5.11.2.
  
• Fix : Scalars stored into the data slot no longer leak.
  
• Fix : Thread destruction should not segfault anymore.
  
• Opt : As a result of removing the deprecated features, less memory is
  used for both threaded (a pointer table is used instead of a
  hash) and non-threaded (no global structure is needed anymore)
  perls.
  
• Rem : As advertised in the precendent version, all the signature
  related features were removed. This includes the 'sig' option
  to wizard(), the getsig() and gensig() functions, and the SIG_*
  constants.