Cargo Features

Compact has no features set by default.

[dependencies]
compact = { version = "0.2.16", features = ["serde-serialization"] }
serde-serialization = serde

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.

serde serde-serialization?