- Make every statically-poked method public and call it directly,
keeping `public_send` only for dynamically-named public methods.
- Read and write state through public `attr_*` accessors instead of
instance variable reflection.
- Enable `Homebrew/NoSendInTests` and
`Homebrew/NoInstanceVariableAccessInTests` now the test suite is
clean, so neither pattern creeps back in.
- Keep rare justified disables, e.g. `Module#remove_const` is
private core Ruby and raw memoisation state has no accessor.
Mike McQuaid