Why does index.ts export option instead of Option

[upomelo]

Just my personal opinion, Option, ReadonlyArray, etc. are more like a module, like a static method of a class, but I found that all the exports of fp-ts in the index.ts are in the form of "pascalCase".

I'm writing some functional modules in my own project, and I want to be consistent with the fp-ts style, so I want to know why fp-ts chose option instead of Option, style preference, historical reasons, or other?

import { option } from 'fp-ts'
option.map(...)
import { Option } from 'fp-ts'
Option.map(...)