Cargo Features

[dependencies]
petri = { version = "0.0.4", default-features = false, features = ["par", "gp", "ga"] }
default = ga

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

par = rayon
gp
ga default

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?

Enables rayon ^0.8.2