Unable to use reuseport with gen_udp:open

[LVala]

Describe the bug
Documentation suggests that from OTP 26, inet:setopts allows to set the reuseport. When trying to set the option with gen_udp:open, I get the following error:

Erlang/OTP 26 [erts-14.0.2] [source] [64-bit] [smp:8:8] [ds:8:8:10] [async-threads:1] [jit]

Eshell V14.0.2 (press Ctrl+G to abort, type help(). for help)
1> gen_udp:open(55001, [{reuseport, true}]).
** exception exit: badarg
     in function  inet_udp:open/2 (inet_udp.erl, line 56)

After looking at otp/lib/kernel/src/inet.erl I noticed that function udp_options doesn't list reuseport as an available option, which is not the case for e.g. listen_options and indeed, gen_tcp:listen works fine with the reuseport:

1> {ok, Socket} = gen_tcp:listen(55001, [{reuseport, true}]).
{ok,#Port<0.3>}

Getting back to UDP, the option can be set via inet:setopts, but that doesn't help, as the next opened socket need to use reuseport as well, which must be set before binding to address:

1> {ok, Socket} = gen_udp:open(55001).
{ok,#Port<0.3>}
2> ok = inet:setopts(Socket, [{reuseport, true}]).
ok
3> inet:getopts(Socket, [reuseport]).
{ok,[{reuseport,true}]}
4> {ok, Sock2} = gen_udp:open(55001).
** exception error: no match of right hand side value {error,eaddrinuse}

My workaround was to use socket module, which works as expected, but the above does not seem to be the desired behaviour.

To Reproduce
Run gen_udp:open(55001, [{reuseport, true}])..

Expected behavior
I expect to be able to use reuseport option when opening UDP socket via gen_udp:open.

Affected versions
OTP 26.0.2
MacOS M1

$ sysctl kern.version
kern.version: Darwin Kernel Version 22.3.0: Thu Jan  5 20:48:54 PST 2023; root:xnu-8792.81.2~2/RELEASE_ARM64_T6000

Additional context
None.

[RaimoNiskanen]

This seems to be a bug in PR #6522 that missed to allow the new options for gen_udp:open/1,2.
I'll start on a fix.

[RaimoNiskanen]

Fix merged to 'maint' to be released in OTP-26.1.
Thank you for reporting this issue!