Cargo Features

[dependencies]
perpendicular = { version = "0.1.9", default-features = false, features = ["alloc", "serialize"] }
default = alloc

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

alloc default
serialize = 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 serialize?