Locale-related test failures with perl 5.22.0 RC2

[eserte]

With a German locale the test suite fails:

        #   Failed test 'should die'
        #   at t/04_client_tests.t line 99.
        # expecting: Regexp ((?^u:Error in 'ping' : Die Wartezeit für die Verbindung ist abgelaufen))
        # found: Error in 'ping' : Connection timed out at t/04_client_tests.t line 99.
        # Looks like you failed 1 test of 2.

    #   Failed test 'ping/is_alive should die in case of internal error'
    #   at t/04_client_tests.t line 102.

        #   Failed test 'should die'
        #   at t/04_client_tests.t line 172.
        # expecting: Regexp ((?^u:Error in 'ping' : Die Wartezeit für die Verbindung ist abgelaufen))
        # found: Error in 'ping' : Connection timed out at t/04_client_tests.t line 171.
        # Looks like you failed 1 test of 1.

    #   Failed test 'ping should die in case of can't send the request'
    #   at t/04_client_tests.t line 174.
    # Looks like you failed 2 tests of 5.

#   Failed test 'ping'
#   at t/04_client_tests.t line 175.
# Looks like you failed 1 test of 10.
t/04_client_tests.t ............ 
Dubious, test returned 1 (wstat 256, 0x100)
Failed 1/10 subtests 

    #   Failed test at t/05_driver_tests.t line 34.
    #     Structures begin differing at:
    #          $got->{error} = 'Connection timed out'
    #     $expected->{error} = 'Die Wartezeit für die Verbindung ist abgelaufen'
    # Looks like you failed 1 test of 1.

#   Failed test 'should call perform_request and return a valid value'
#   at t/05_driver_tests.t line 38.
# Looks like you failed 1 test of 3.
t/05_driver_tests.t ............ 
Dubious, test returned 1 (wstat 256, 0x100)
Failed 1/3 subtests 
... (and more) ...

This looks similar to #18 but the issue mentioned there is already fixed in perl.

[eserte]

Happens also with Riak-Light 0.12.