Cargo Features

app_units = { version = "0.7.5", default-features = false, features = ["num_traits", "serde_serialization"] }
default = num_traits, serde_serialization

These default features are set whenever app_units is added without default-features = false somewhere in the dependency tree.

num_traits default = num-traits
serde_serialization default = 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.

num-traits num_traits
serde serde_serialization