Cargo Features

Fountain has no features set by default.

[dependencies]
fountain = { version = "0.1.12", features = ["use_serde"] }
use_serde = 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 use_serde?