Update Unicode to 15.0

[headius]

For JRuby 10 we will not update Unicode, but this should happen in an update release.

Failures from ruby/spec:

50)
RbConfig::CONFIG['UNICODE_EMOJI_VERSION'] is 15.0 FAILED
Expected "13.1" == "15.0"
to be truthy but was false
/Users/headius/work/jruby/spec/ruby/library/rbconfig/unicode_emoji_version_spec.rb:20:in 'block in <main>'
org/jruby/RubyBasicObject.java:2665:in 'instance_exec'
org/jruby/RubyArray.java:4919:in 'all?'
org/jruby/RubyArray.java:2123:in 'each'
/Users/headius/work/jruby/spec/ruby/library/rbconfig/unicode_emoji_version_spec.rb:4:in '<main>'
org/jruby/RubyKernel.java:1179:in 'load'
org/jruby/RubyBasicObject.java:2665:in 'instance_exec'
org/jruby/RubyArray.java:2123:in 'each'

51)
RbConfig::CONFIG['UNICODE_VERSION'] is 15.0.0 FAILED
Expected "13.0.0" == "15.0.0"
to be truthy but was false
/Users/headius/work/jruby/spec/ruby/library/rbconfig/unicode_version_spec.rb:20:in 'block in <main>'
org/jruby/RubyBasicObject.java:2665:in 'instance_exec'
org/jruby/RubyArray.java:4919:in 'all?'
org/jruby/RubyArray.java:2123:in 'each'
/Users/headius/work/jruby/spec/ruby/library/rbconfig/unicode_version_spec.rb:4:in '<main>'
org/jruby/RubyKernel.java:1179:in 'load'
org/jruby/RubyBasicObject.java:2665:in 'instance_exec'
org/jruby/RubyArray.java:2123:in 'each'

[ahorek]

updated in jruby/jcodings#66

[ahorek]

@headius could you update joni before the release to satisfy the dependency check? thanks

[headius]

jcodings 1.0.62 has been released as well as joni 2.2.4 with the updated jcodings!

[headius]

I have pushed #8667 to update jcodings and joni, but we may not want to do that in a 9.4 update. In any case, this will be fixed by #8667.

[ahorek]

technically, the change belongs to 10.0, but it would block backporting future updates in joni and jcodings to version 9.4.

[headius]

@ahorek Yeah I'm not sure we're ready to leave 9.4 behind like that just yet.

[ahorek]

1/ we could either maintain more versions
jruby 9.4, jcodings 1.0.61.[1234], unicode 13 (backports)
jruby 10.0, jcodings 1.0.62+, unicode 15
which is safer, but more maintenance

2/ or update JRuby 9.4 to Unicode 15.
The CRuby team doesn’t backport major Unicode updates, even to maintained branches. However, the actual differences are minor, making it unlikely to break any applications.

the only tests that failed were version checks RbConfig::CONFIG['UNICODE_VERSION'] is 13.0.0 FAILED - Expected "15.0.0" == "13.0.0"
and by design, unicode should be backward-compatible

[ahorek]

If someone relies on unconventional parsing and makes assumptions about the Unicode version based on the Ruby version, they should instead use RbConfig::CONFIG['UNICODE_VERSION'] to determine the correct Unicode version. Otherwise, it shouldn't be a problem.

there were no breaking backward incompatible changes between 13-15 and in the past. New versions mostly add new characters like emojis...