jruby-rack

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For a Rails app running under Tomcat via Warbler, upgrading from JRuby 9.1.17.0 (Ruby 2.3.3 compatibility) to JRuby 9.2.14.0 (Ruby 2.5.7 compatibility) with jruby-rack 1.1.21 gives me the following new deprecation warnings on application startup:

uri:classloader:/jruby/rack/response.rb:294: warning: constant ::Fixnum is deprecated
uri:classloader:/jruby/rack/core_ext.rb:26: warning: constant ::NativeException is deprecated

These correspond to:

• https://github.com/jruby/jruby-rack/blob/1.1.21/src/main/ruby/jruby/rack/response.rb#L294
• https://github.com/jruby/jruby-rack/blob/1.1.21/src/main/ruby/jruby/rack/core_ext.rb#L26

Apparently, Fixnum has been replaced by Integer, and seems to already be fixed on master (via removal), just not in any jruby-rack release. I'm not sure on the best path forward for NativeException, or the best way to be compatible with both Ruby 2.3.3 and 2.5.7+ if that's desired.