Native Rust encoder and decoder of TOML-formatted files and streams - feature "indexmap" and 1 more

 Provides implementations of the standard Serialize/Deserialize traits for TOML
 data to facilitate deserializing and serializing Rust structures.
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 This metapackage enables feature "indexmap" for the Rust toml crate, by pulling
 in any additional dependencies needed by that feature.
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 Additionally, this package also provides the "preserve_order" feature.