Cargo Features

[dependencies]
insert_many = { version = "0.1.1", default-features = false, features = ["smallvec"] }
default = smallvec

The smallvec feature is set by default whenever insert_many 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.

smallvec default

Enables smallvec ^0.2.0