We have many side projects in flight and no place to track them. I'm creating this list so we remember all the things we hope to ship in 9.2.

• Ruby 2.5 support: largely complete, see Unimplemented Ruby 2.5 Features #5118 and Ruby 2.5 Gemification #4875.

• New block dispatch, optimization: https://github.com/jruby/jruby/tree/block_dispatch

• Encoding work for identifiers, symbols: (see Properly represent all encodings in methods/constants/variables/symbols #4965)

• Finish native process, IO logic for Windows: Improve Open3 on Windows #4964, File.open() on Windows without binary flag reading 0x0A (newline) instead of 0x0D (return) #5100, Open3.capture3 error on Windows #1187, Implement io/console for windows #3705, Implement native Kernel#spawn on Windows #4076, Implement Kernel/Process spawn on Windows #3116 and others

• Proper AOT support: currently AOT just compiles to IR and serializes it into a .class. We can produce actually-compiled .class that jlink, jaotc, appcds can do a lot with.

• Profiling and inlining of IR: https://github.com/jruby/jruby/tree/profiler

• Full refinements support: partial and spotty right now

• CRuby look-alike API: see org.jruby.api.API. Most of what would live here already exists, and just needs a stub.

• Pure-Ruby Enumerable: Enumerator's Yielder does not pass through one-elt array properly #4108, lazy map adds extra array layer to single-element array output #5044

• Reimplement Enumerator#next with Fiber: Lazy enumerable select eagerly evaluates next item #4212, Enumerator out of memory error #2577

• Reimplement Set/SortedSet (set.rb) in native with JI support: native implementation of set.rb #4690

• Reimplement Date/DateTime (date.rb library) in native: redo date.rb (most) parts in native #5076

• support Java 8 date-time APIs (to_java) with Ruby types - Time/Date/DateTime

From #4293:

• String

  • String#upcase, String#downcase, String#capitalize, String#swapcase and their bang variants work for all of Unicode, and are no longer limited to ASCII. Supported encodings are UTF-8, UTF-16BE/LE, UTF-32BE/LE, and ISO-8859-1~16. Variations are available with options. See the documentation of String#downcase for details. Feature #10085

• Symbol

  • Symbol#upcase, Symbol#downcase, Symbol#capitalize, and Symbol#swapcase now work for all of Unicode. See the documentation of String#downcase for details. Feature #10085