Function plain_media_type_for 

pub fn plain_media_type_for(compact: &str) -> Option<&'static str>

The plain type a compact type stands for; the inverse of compact_media_type_for.

use cratestack_core::compact::{COMPACT_JSON, plain_media_type_for};
assert_eq!(plain_media_type_for(COMPACT_JSON), Some("application/json"));
assert_eq!(plain_media_type_for("application/json"), None);