extra cfg macros causing build issues in higher-level libraries
#![cfg_attr(feature = "nightly", feature(external_doc))]
#![cfg_attr(feature = "nightly", doc(include = "../README.md"))]
#![cfg_attr(feature = "nightly", deny(missing_docs))]
-#![cfg(target_arch = "x86_64")]
-#![cfg(target_feature = "aes")]
//!
