Cargo Features

[dependencies]
positioned-io2 = { version = "0.3.4", default-features = false, features = ["byteorder"] }
default = byteorder

The byteorder feature is set by default whenever positioned-io2 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.

byteorder default