diff --git a/src/lib.rs b/src/lib.rs
index 090cda4..be254d3 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -15,7 +15,7 @@ use std::path::{Path, PathBuf};
 use heapsize::HeapSizeOf;
 use kg_diag::io::fs;
 use kg_diag::*;
-use kg_symbol::Symbol;
+use kg_symbol::{Symbol, SymbolMap};
 use kg_utils::collections::LinkedHashMap;
 
 pub use tree::convert::Primitive;
@@ -26,7 +26,7 @@ pub use tree::{NodeRef, TreeErrorDetail};
 
 mod tree;
 
-pub type Properties = LinkedHashMap<Symbol, NodeRef>;
+pub type Properties = SymbolMap<NodeRef>;
 pub type Elements = Vec<NodeRef>;
 
 pub mod diff;
diff --git a/src/opath/expr/func.rs b/src/opath/expr/func.rs
index 63e582e..5bc8062 100644
--- a/src/opath/expr/func.rs
+++ b/src/opath/expr/func.rs
@@ -578,7 +578,7 @@ pub(super) fn apply_func_to(
                 out.add(NodeRef::object(Properties::new()));
             } else if args.count() == 1 {
                 let values = args.resolve_column(false, 0, env)?;
-                let mut map = LinkedHashMap::with_capacity(values.len());
+                let mut map = Properties::with_capacity(values.len());
                 for value in values.into_iter() {
                     if let Value::Object(ref props) = value.data().value() {
                         for (k, v) in props.iter() {
@@ -591,7 +591,7 @@ pub(super) fn apply_func_to(
                 args.check_count_func(id, 2, 2)?;
                 let keys = args.resolve_column(false, 0, env)?;
                 let values = args.resolve_column(true, 1, env)?;
-                let mut map = LinkedHashMap::with_capacity(std::cmp::min(keys.len(), values.len()));
+                let mut map = Properties::with_capacity(std::cmp::min(keys.len(), values.len()));
                 for (k, v) in keys.into_iter().zip(values.into_iter()) {
                     map.insert(k.as_string().to_string().into(), v);
                 }
diff --git a/src/serial/de.rs b/src/serial/de.rs
index 593f4d7..fc59a90 100644
--- a/src/serial/de.rs
+++ b/src/serial/de.rs
@@ -498,7 +498,7 @@ impl<'a, 'de> serde::de::SeqAccess<'de> for Array<'a> {
 }
 
 struct Object<'a> {
-    iter: kg_utils::collections::linked_hash_map::Iter<'a, Symbol, NodeRef>,
+    iter: kg_symbol::Iter<'a, NodeRef>,
     value: Option<&'a NodeRef>,
 }
 
diff --git a/src/serial/fmt/toml.rs b/src/serial/fmt/toml.rs
index 4610998..23c9581 100644
--- a/src/serial/fmt/toml.rs
+++ b/src/serial/fmt/toml.rs
@@ -798,7 +798,7 @@ impl Parser {
 
     pub fn parse(&mut self, r: &mut dyn CharReader) -> Result<NodeRef, Error> {
         self.token_queue.clear();
-        let mut root = NodeRef::object(LinkedHashMap::new());
+        let mut root = NodeRef::object(Properties::new());
         self.parse_inner(r, &mut root)?;
         Ok(root)
     }
@@ -926,7 +926,7 @@ impl Parser {
                             );
                         }
                     } else {
-                        let new = NodeRef::object(LinkedHashMap::new()).with_span(token.span());
+                        let new = NodeRef::object(Properties::new()).with_span(token.span());
                         current
                             .add_child(None, Some(key.into()), new.clone())
                             .unwrap();
@@ -1041,7 +1041,7 @@ impl Parser {
         if let Some(existing) = node.get_child_key(&key) {
             return Ok(existing);
         } else {
-            let table = NodeRef::object(LinkedHashMap::new()).with_span(Span::with_pos(from, to));
+            let table = NodeRef::object(Properties::new()).with_span(Span::with_pos(from, to));
             node.add_child(None, Some(key.into()), table.clone())
                 .unwrap();
             Ok(table)
@@ -1051,7 +1051,7 @@ impl Parser {
     fn parse_inline_table(&mut self, r: &mut dyn CharReader) -> Result<NodeRef, Error> {
         let from = self.expect_token(r, Terminal::BraceLeft)?.from();
 
-        let mut table = NodeRef::object(LinkedHashMap::new());
+        let mut table = NodeRef::object(Properties::new());
         loop {
             let (mut node, key) = self.parse_key(r, &mut table)?;
             self.expect_token(r, Terminal::Equals)?;
@@ -1092,7 +1092,7 @@ impl Parser {
         self.expect_token(r, Terminal::BracketRight)?;
         let to = self.expect_token(r, Terminal::BracketRight)?.to();
 
-        let table = NodeRef::object(LinkedHashMap::new()).with_span(Span::with_pos(from, to));
+        let table = NodeRef::object(Properties::new()).with_span(Span::with_pos(from, to));
 
         if node.is_array() {
             if self.is_static_array(&node) {
diff --git a/tests/tests/opath/expr/func.rs b/tests/tests/opath/expr/func.rs
index 1a7d69d..aeeb81e 100644
--- a/tests/tests/opath/expr/func.rs
+++ b/tests/tests/opath/expr/func.rs
@@ -2,13 +2,14 @@ use super::*;
 use kg_diag::Diag;
 use kg_tree::opath::FuncCallErrorDetail;
 use kg_tree::opath::NodeSet;
+
 macro_rules! eval_opath {
     ($opath:expr) => {{
         let opath = match kg_tree::opath::Opath::parse($opath) {
             Ok(op) => op,
             Err(err) => panic!("Error parsing opath!: {}", err),
         };
-        let root = NodeRef::object(kg_utils::collections::LinkedHashMap::new());
+        let root = NodeRef::object(Properties::new());
 
         opath.apply(&root, &root)
     }};