Steps

Downloads CSV files from iana.org Parses the CSVs into only a new-line delimited list of mime strings Embeds a newline separated list of mimes in top_level constants

Features

Serde

Includes Serde derives on all types

Cli

Includes a very simple cli, mainly for testing

Compact

Uses CompactStr for the sub_type instead of a normal String Should keep the string on the stack, because the vast majority are small enough (under ~25 chars, I think)