• Add a test file to ensure 'GETMAGIC' called once [gfx]
  
• "GETMAGIC" should be called only once [gfx]
  
• Use PERL_NO_GET_CONTEXT for efficiency (see perlguts) [gfx]
  
• Don't care about dVAR. ExtUtils::ParseXS deals with it. [gfx]
  
• t/p_max.t, t/p_min.t fail on perl5.8.1. [tokuhirom]
  
• avoid non-portable warnings
  
• Fix PP::reftype in edge cases [gfx]