Log Message:
Update to 1.18
--------------
1.18    2015-02-13
- We no longer attempt to save and restore an existing $SIG{__DIE__} hook
  before calling a validation callback. This uses undocumented black magic
  poking at the Perl interpreter guts, which seems to cause sporadic
  segfaults. Reported by David Wheeler with help from Andreas Koenig. RT
  #102112.