Cargo Features

creature_feature has no features set by default.

[dependencies]
creature_feature = { version = "0.1.7", features = ["serde1", "heapless"] }
serde1 = serde
heapless

Enables heapless ^0.7.16

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 serde1?