Environment Information

Provide at least:

• JRuby version: jruby 9.4.2.0 (3.1.0) 2023-03-08 90d2913 Java HotSpot(TM) 64-Bit Server VM 25.333-b02 on 1.8.0_333-b02 +jit [x86_64-darwin]
• Operating system and platform: Darwin MacBook-Pro.lan 21.6.0 Darwin Kernel Version 21.6.0: Mon Aug 22 20:17:10 PDT 2022; root:xnu-8020.140.49~2/RELEASE_X86_64 x86_64

Jruby does not implement Addrinfo#ipv6_unique_local?.

 require "socket"
Addrinfo.new("::1").ipv6_unique_local?
#  undefined method `ipv6_unique_local?' for #<Addrinfo: ::1> (NoMethodError)
# Did you mean?  ipv6_sitelocal?
#        from org/jruby/RubyKernel.java:1143:in `eval'