Purpose of the public fields `i0`, `i1` and `i2` in the `Some` and `None` classes of `Option.ts`.
Weird question, I'm just curious and have been reading some the source code out of interest. Why do the
Some and None class in data/src/internal/Option.ts both have the public fields i0, i1 and i2? It looks like i0 is used to store the value in Some, but what are the others for?
