Failed to parse nextcloud config

[solracsf]

config.php

..
'memcached_servers' => [
  ['127.0.0.1', 11211],
],
'memcached_options' => [
  \Memcached::OPT_SERIALIZER => \Memcached::SERIALIZER_IGBINARY,
],
...

error

Nov 12 20:37:49 nbg1-ceph notify_push[1054841]: Error:
Nov 12 20:37:49 nbg1-ceph notify_push[1054841]:    0: #033[91mFailed to parse config#033[0m
Nov 12 20:37:49 nbg1-ceph notify_push[1054841]:    1: #033[91mFailed to parse nextcloud config#033[0m
Nov 12 20:37:49 nbg1-ceph notify_push[1054841]:    2: #033[91mError while parsing '/config/config.php':
Nov 12 20:37:49 nbg1-ceph notify_push[1054838]:    2: #033[m#033[1m#033[38;5;12m86 | #033[m    \Memcached::OPT_SERIALIZER => \Memcached::SERIALIZER_IGBINARY,
Nov 12 20:37:49 nbg1-ceph notify_push[1054838]:    2:    #033[1m#033[38;5;12m|     #033[1m#033[38;5;9m^^ No valid token found, expected one of boolean literal, integer literal, float literal, string literal, 'null', ']', 'array' or '['
Nov 12 20:37:49 nbg1-ceph notify_push[1054841]:    2:
Nov 12 20:37:49 nbg1-ceph notify_push[1054841]:    2: #033[m#033[1m#033[38;5;12m.. |
Nov 12 20:37:49 nbg1-ceph notify_push[1054841]:    2: #033[m#033[1m#033[38;5;12m85 | #033[m  ],
Nov 12 20:37:49 nbg1-ceph notify_push[1054838]:    2: #033[m#033[1m#033[38;5;12m87 | #033[m  ],
Nov 12 20:37:49 nbg1-ceph notify_push[1054838]:    2: #033[m#033[1m#033[38;5;12m88 | #033[m);
Nov 12 20:37:49 nbg1-ceph notify_push[1054838]:    2: #033[m#033[0m

It is ok with:

'memcached_servers' =>
  array (
    0 =>
    array (
      0 => '127.0.0.1',
      1 => 11211,
    ),
  ),
'memcached_options' =>
  array (
    -1003 => 2,
  ),

[joshtrichards]

Similar to #323 perhaps?