There is an ongoing outage on the primary CPAN mirror. It is possible to work around the issue by using MetaCPAN as a mirror.

FRACTAL / Test-ZeroCopy-0.110 / Changes 
0.110   2014-10-30
  * Avoid creating a new stack frame to better integrate
    with Test::More (thanks Salvador)

0.100   2014-04-19
  * Initial CPAN release