How to free memory after required modules

No misunderstanding - I think there might be a bug in Espruino - I'll look into it.

If you try a different module it works as I suggested:

>process.memory().usage
=17
>g=require("KeyPad")
={ ... }
>process.memory().usage
=61
>g=""
=""
>process.memory().usage
=62
>Modules.removeAllCached()
=undefined
>process.memory().usage
=19