> If you had to pick between having REPL access in production and REPL access locally, would it be close? Because I value being able to mess around with a REPL

> If you had to pick between having REPL access in production and REPL access locally, would it be close? Because I value being able to mess around with a REPL while developing thousands of times as much as I like a neat toy in production. And that ability is exactly what Python or Ruby or Erlang give you. Technically lacking compared to the full suite? Perhaps. But we're talking 0.999, not 0.5. I can't speak to Ruby or Erlang, but the Python REPL is much less than 0.999 because of the semantics of "import" making it very challenging to change code once it's been imported.