Cargo Features

chemical_elements = { version = "0.3.0", default-features = false, features = ["mzpeaks", "serde"] }
default = mzpeaks, serde

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

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.

mzpeaks default

Enables mzpeaks ^0.8.0

serde default