Cargo Features

CardinalityEstimator has no features set by default.

[dependencies]
cardinality-estimator = { version = "1.0.2", features = ["with_serde"] }
with_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 with_serde?