The `planck.repl` namespace was required in `planck.io` and `planck.http` with https://github.com/planck-repl/planck/commit/80b487c7b8472b36397177bbdf88cdb63173d769 but this need was later removed with https://github.com/planck-repl/planck/commit/3bc8b174834cf413dbc7415f7af30955adcc27b0.