Ark 1.20: t/plugin_session_expire.t fails with Plack 1.0036

[eserte]

Test log:

Use of uninitialized value $expires in pattern match (m//) at /home/eserte/.cpan/build/Cookie-Baker-0.05-q7zmW1/blib/lib/Cookie/Baker.pm line 60.
Use of uninitialized value $expires in pattern match (m//) at /home/eserte/.cpan/build/Cookie-Baker-0.05-q7zmW1/blib/lib/Cookie/Baker.pm line 64.
Use of uninitialized value $expires in string eq at /home/eserte/.cpan/build/Cookie-Baker-0.05-q7zmW1/blib/lib/Cookie/Baker.pm line 69.
Use of uninitialized value in concatenation (.) or string at /home/eserte/.cpan/build/Cookie-Baker-0.05-q7zmW1/blib/lib/Cookie/Baker.pm line 36.

#   Failed test 'session expires ok'
#   at t/plugin_session_expire.t line 38.
#                   'testapp_session=10decc7e17e9ddd4906adb6e1608db26d697c65a; expires='
#           matches '(?^:expires=)'
# Looks like you failed 1 test of 2.
t/plugin_session_expire.t .............. 
Dubious, test returned 1 (wstat 256, 0x100)
Failed 1/2 subtests 

With other Plack versions (1.0034 and earlier) there's no test failure.