Cargo Features

[dependencies]
indextree = { version = "4.6.1", default-features = false, features = ["std", "deser", "par_iter"] }
default = std

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

std default
deser = serde
par_iter = rayon

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.

rayon par_iter?
serde deser?