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Re:Ruby Garbage Collection Deep Dive: Tri-Color Mark and Sweep by tenderlove on Thursday February 18, 2021 @01:55PM (#26183958)
RVALUE is the base type in Ruby's heap. It refers specifically to [this struct](https://github.com/ruby/ruby/blob/7bd93293621b85a87e7e117317...). All Ruby objects are instances of an RVALUE struct.

Hope that helps!

Re:Ruby Garbage Collection Deep Dive: Tri-Color Mark and Sweep by WJW on Thursday February 18, 2021 @05:32PM (#26186706)
In particular in Ruby it derives from "Ruby value" rather than the C/C++ rvalues that can appear on the righthand side of an assignment.