Cargo Features

[dependencies]
xprs = { version = "0.1.0", default-features = false, features = ["pemdas", "pejmdas", "compile-time-optimizations"] }
default = compile-time-optimizations, pemdas

These default features are set whenever xprs is added without default-features = false somewhere in the dependency tree.

pemdas default
pejmdas
compile-time-optimizations default

Xprs has 4 features without comments.