Cargo Features

[dependencies]
fractional_index = { version = "2.0.2", default-features = false, features = ["serde"] }
default = serde

The serde feature is set by default whenever fractional_index is added without default-features = false somewhere in the dependency tree.

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 default

Affects fractional_index::stringify, fractional_index::lexico