An Array of `$listen_addresses` doesn't work

[arjenz]

Describe the Bug

$listen_addresses doesn't work for Arrays

Expected Behavior

If I specify $listen_addresses as an Array of IPs, I expect them to show up in the postgresql config, but only the first one shows up.
REFERENCE.md:

listen_addresses

Data type: Optional[Variant[String[1], Array[String[1]]]]

Address list on which the PostgreSQL service will listen

Steps to Reproduce

Steps to reproduce the behavior:

class { '::postgresql::server':
  listen_addresses => [ $facts['networking']['ip'], '127.0.0.1'],
}
# grep 127.0.0.1 postgresql.conf
# grep $(puppet facts networking.ip | jq -r .[]) postgresql.conf
listen_addresses = '192.168.104.11'
#

Environment

• 10.6.1 and older, also main
• Tested on Ubuntu 24.04, 22.04.

Additional Context

class { '::postgresql::server':
  listen_addresses => [ $facts['networking']['ip'], '127.0.0.1' ].join(','),
}
# grep 127.0.0.1 postgresql.conf
listen_addresses = '192.168.104.12,127.0.0.1'
#

as a workaround works. There is some sanity checking, but this escapes that checking luckily.