//! [JsWord] is an interened string.
//!
//! This type should be used instead of [String] for values, because lots of
//! values are duplicated. For example, if an identifer is named `myVariable`,
//! there will be lots of identifier usages with the value `myVariable`.
//!
//! This type
//! - makes equality comparison faster.
//! - reduces memory usage.
include!;