Cargo Features

[dependencies]
serde_default_utils = { version = "0.3.1", default-features = false, features = ["std", "inline"] }
default = std

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

std default
inline = serde-inline-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.

serde-inline-default inline?