• Exception handling is totally MSVC specific, so only use it there
  
  • this means that we don't need to use a C++ compiler anywhere
    
• Rework bit-vector tracking mechanism to use a 256-way tree. This avoids
  making assumptions about 64-bit platforms' memory layouts, and eliminates
  the fatal error introduced in 0.72 when the assumption was violated.
  
• Convert to XSLoader
  
• Resolve CPAN #49437 (Devel::Size adds magic in Perl 5.10)
  
• Resolve CPAN #58484 and #58485 (related to CVs that are XSUBs)