Cargo Features

toml-spanned-value has no features set by default.

toml-spanned-value = { version = "0.1.0", features = ["preserve_order"] }
preserve_order = indexmap

Analogous to the preserve_order feature of toml-rs

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.

indexmap preserve_order?

Enables indexmap ^1.3