Cargo Features

[dependencies]
bobr = { version = "0.2.2", default-features = false, features = ["format+json", "format+yaml", "format+toml"] }
default = format+json

The format+json feature is set by default whenever bobr is added without default-features = false somewhere in the dependency tree.

format+json default = serde_json
format+yaml = serde_yml
format+toml = toml

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_json format+json
serde_yml format+yaml?
toml format+toml?