Add stub test for public module method that was private #902
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Adds a test to stub a method that was previously private and explicitly made public. For some reason, this fails on Ruby 3.1.0 (the method reverts to being private). This is a regression in CRuby somewhere, probably related to method aliasing. Still, I believe the test is worth adding to prevent future regressions.
I've opened https://bugs.ruby-lang.org/issues/18600 as well to address the regression in Ruby.