[ji] proper key? checking semantics for Map#7238
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enebo merged 3 commits intojruby:jruby-9.3from Jun 21, 2022
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the gist of the changes is to fix the
java.util.Map#key?case with nil valuesjruby -v -e "map = java.util.HashMap.new; map[:key] = nil; p map.size; p map.key? :key"also on the Java consumer side having a "clean" way of checking a
IRubyObjectis present in the Hash seemed lacking ...