Cargo Features

chksum-hash-sha2-224 has no features set by default.

[dependencies]
chksum-hash-sha2-224 = { version = "0.0.1", features = ["fuzzing"] }
fuzzing = arbitrary

Features from optional dependencies

In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features. These features may have been created by mistake, and this functionality may be removed in the future.

arbitrary fuzzing?