Cargo Features

a4-core has no features set by default.

[dependencies]
a4-core = { version = "0.0.4", features = ["std"] }
std

Enables std of serde

serde:

Provide impls for common standard library types like Vec<T> and HashMap<K, V>.
Requires a dependency on the Rust standard library.

a4-core has 1 feature without comment.