Cargo Features

reep-id-string has no features set by default.

[dependencies]
reep-id-string = { version = "0.2.0", features = ["rustc-serialize-support", "serde-support"] }
rustc-serialize-support = rustc-serialize
serde-support = serde

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.

rustc-serialize rustc-serialize-support?
serde serde-support?

Enables serde ^0.8