Cargo Features

[dependencies]
validatron = { version = "0.5.0", default-features = false, features = ["use-indexmap", "use-serde"] }
default = use-serde

The use-serde feature is set by default whenever validatron is added without default-features = false somewhere in the dependency tree.

use-indexmap = indexmap
use-serde 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.

serde use-serde
indexmap use-indexmap?

Enables indexmap ^1