• Add : The new constant VMG_COMPAT_GLOB_GET tells you whether get magic
  is called for globs. It's true starting perl 5.13.2.
  
• Chg : All callbacks are now called within an eval-like context.
  Only free callbacks used to be called that way.
  
• Fix : Some exceptions thrown from a free callback could be lost.
  
• Fix : Croak messages could sometimes be repeated several times.
  
• Fix : t/41-clone.t segfaulting with perl 5.13.2.