Switch from LinkedHashMap to IndexMap

Author: David Orchard

Cargo.toml

@@ -21,7 +21,7 @@ yaml = ["yaml-rust"]
 hjson = ["serde-hjson"]
 ini = ["rust-ini"]
 json5 = ["json5_rs"]
-preserve_order = ["linked-hash-map", "toml/preserve_order", "serde_json/preserve_order", "ron/indexmap"]
+preserve_order = ["indexmap", "toml/preserve_order", "serde_json/preserve_order", "ron/indexmap"]
 
 [dependencies]
 async-trait = "0.1.50"
@@ -36,7 +36,7 @@ serde-hjson = { version = "0.9", default-features = false, optional = true }
 rust-ini = { version = "0.17", optional = true }
 ron = { version = "0.6", optional = true }
 json5_rs = { version = "0.3", optional = true, package = "json5" }
-linked-hash-map = { version = "0.5.4", optional = true, features = ["serde_impl"] }
+indexmap = { version = "1.7.0", features = ["serde-1"], optional = true}
 
 [dev-dependencies]
 serde_derive = "1.0.8"

src/builder.rs

@@ -1,7 +1,6 @@
 use std::iter::IntoIterator;
 use std::str::FromStr;
 
-
 use crate::error::Result;
 use crate::map::MapImpl;
 use crate::source::AsyncSource;

src/map.rs

@@ -1,4 +1,4 @@
 #[cfg(not(feature = "preserve_order"))]
 pub type MapImpl<K, V> = std::collections::HashMap<K, V>;
 #[cfg(feature = "preserve_order")]
-pub type MapImpl<K, V> = linked_hash_map::LinkedHashMap<K, V>;
+pub type MapImpl<K, V> = indexmap::IndexMap<K, V>;