Cargo Features

Rowan has no features set by default.

rowan = { version = "0.15.15", features = ["serde1"] }
serde1 = serde

Enables serde of text-size

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 serde1?