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Re:Optimizing Ruby lazy initialization in TruffleRuby with d... by sdegutis on Saturday April 11, 2020 @03:06PM (#22843447)
I interpreted that sentence as meaning it was integrated into the JRuby project as a "home" for the project, similar to being under the management of a particular github org. Not that its implementation was in any way changed or integrated into JRuby.
Re:Optimizing Ruby lazy initialization in TruffleRuby with d... by ericb on Saturday April 11, 2020 @08:53PM (#22845307)
Your interpretation is understandable, but incorrect.

https://www.jruby.org/2016/05/03/jruby-9-1-0-0.html

Re:Optimizing Ruby lazy initialization in TruffleRuby with d... by eregon on Monday April 13, 2020 @11:20AM (#22856586)
Concretely, TruffleRuby never shared much in terms of the core language implementation with JRuby (essentially the parser and encoding stuff, never core methods/operators/etc).