This bug will track all NEWS items new in Ruby 2.4. This list is based off https://github.com/ruby/ruby/blob/trunk/NEWS.
Only changes relevant to JRuby are listed here. MRI-specific internal changes and features are not included.
NOTE: Pull requests should be done against the
Core classes updates (outstanding ones only)
Stdlib updates (only items that need specific attention in JRuby)
Compatibility issues (excluding feature bug fixes)
Stdlib compatibility issues (excluding feature bug fixes)
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@ianks Any that make sense! Obviously some things, like potential Hash optimizations, would have to be in Java, but many of these features would be just fine in Ruby. See https://github.com/jruby/jruby/tree/master/core/src/main/ruby/jruby/kernel.