• Add : Copy callbacks now receive the current key/index in $[2].
  The current value/element is now in $[3].
  
• Chg : The trigger of copy magic on list assignment with perls greater
  than 5.10.0 was caused by uvar magic. Hence,
  VMG_COMPAT_HASH_LISTASSIGN_COPY was removed. Use VMG_UVAR
  instead.
  
• Fix : Build failures on patched perls.
  
• Tst : Added missing exported symbols to 01-import.t.