The commit e99b3c7 releasing version 0.2.2 explicitly deprecates twoway in favour of memchr crate.
e99b3c7
twoway
memchr
{ "license": "CC0-1.0" }
{ "affected_functions": null, "affects": { "arch": [], "os": [], "functions": [] } }
[]
null
"unmaintained"
"https://github.com/rustsec/advisory-db/blob/osv/crates/RUSTSEC-2021-0146.json"