Running Oils as build shell

This document describes issues and notes on running Oils as Shell replacement in package building (either as /bin/bash or /bin/sh)

Nixpkgs

Oily Nixpkgs is an attempt at replacing bash with Oils in the stdenv.

Bugs/incompatibilities found with nixpkgs

• zulip, PR - "${a[@]+default}" doesn't properly expand as bash
• zulip, commit - ${mystr[@]} errors (e.g. it's a string) are often silent in bash