This has been an attr_accessor since the beginning of Brakeman time. Guess how many should be attr_reader instead? https://github.com/presidentbeef/brakeman/blob/3915a793e84fe5c274f0320f50fc3a5d9c48c2c8/lib/brakeman/tracker.rb#L12-L15
Ruby Easter egg
Also I ran into an 'Easter egg' almost immediately... try pressing tab after `RubyVM` 😜 I guess they are trying to avoid exposing some internal Ruby guts in the auto-complete.