I tried to backport cf7d07570f50ef9c16007019afcff11ba6500d70 and c6aa65430fbb94651f4d15e2a976f59b5475ca19 into ruby_3_1 branch, but the test test_utf8_method_names
failed. Maybe some more changesets are needed. I will investigate it further.
TestObjSpace#test_utf8_method_names:
JSON::ParserError: 859: unexpected token at '{"address":"0x10465a248", "type":"STRING", "class":"0x101cf2450", "embedded":true, "bytesize":2, "value":"12", "encoding":"UTF-8", "file":"/Users/nagachika/opt/ruby-3.1/src/ruby_3_1/test/objspace/test_objspace.rb", "line":649, "method":"utf8_\u00ff'
/Users/nagachika/opt/ruby-3.1/src/build/.ext/common/json/common.rb:216:in `parse'
/Users/nagachika/opt/ruby-3.1/src/build/.ext/common/json/common.rb:216:in `parse'
/Users/nagachika/opt/ruby-3.1/src/ruby_3_1/test/objspace/test_objspace.rb:642:in `test_utf8_method_names'