diff --git a/.eslintrc b/.eslintrc
index 30de5dd..4729eb6 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -19,6 +19,7 @@
 		"no-invalid-this": 0,
 		"object-curly-newline": 0,
 		"sort-keys": 0,
+		"max-lines": "warn",
 	},
 
 	"overrides": [
diff --git a/index.js b/index.js
index ce507da..3788990 100644
--- a/index.js
+++ b/index.js
@@ -66,7 +66,7 @@ function isWritable(object, key) {
 	return !gopd(object, key).writable;
 }
 
-function copy(src) {
+function copy(src, options) {
 	if (typeof src === 'object' && src !== null) {
 		var dst;
 
@@ -98,7 +98,8 @@ function copy(src) {
 			}
 		}
 
-		forEach(ownEnumerableKeys(src), function (key) {
+		var iteratorFunction = options.includeSymbols ? ownEnumerableKeys : objectKeys;
+		forEach(iteratorFunction(src), function (key) {
 			dst[key] = src[key];
 		});
 		return dst;
@@ -106,6 +107,7 @@ function copy(src) {
 	return src;
 }
 
+/** @type {TraverseOptions} */
 var emptyNull = { __proto__: null };
 
 function walk(root, cb) {
@@ -113,10 +115,11 @@ function walk(root, cb) {
 	var parents = [];
 	var alive = true;
 	var options = arguments.length > 2 ? arguments[2] : emptyNull;
+	var iteratorFunction = options.includeSymbols ? ownEnumerableKeys : objectKeys;
 	var immutable = !!options.immutable;
 
 	return (function walker(node_) {
-		var node = immutable ? copy(node_) : node_;
+		var node = immutable ? copy(node_, options) : node_;
 		var modifiers = {};
 
 		var keepGoing = true;
@@ -164,7 +167,7 @@ function walk(root, cb) {
 		function updateState() {
 			if (typeof state.node === 'object' && state.node !== null) {
 				if (!state.keys || state.node_ !== state.node) {
-					state.keys = ownEnumerableKeys(state.node);
+					state.keys = iteratorFunction(state.node);
 				}
 
 				state.isLeaf = state.keys.length === 0;
@@ -233,15 +236,29 @@ function walk(root, cb) {
 	}(root)).node;
 }
 
+/** @typedef {{ immutable?: boolean, includeSymbols?: boolean }} TraverseOptions */
+
+/**
+ * A traverse constructor
+ * @param {object} obj - the object to traverse
+ * @param {TraverseOptions | undefined} [options] - options for the traverse
+ * @constructor
+ */
 function Traverse(obj) {
+	/** @type {TraverseOptions} */
+	this.options = arguments.length > 1 ? arguments[1] : emptyNull;
 	this.value = obj;
 }
 
+/** @type {(ps: PropertyKey[]) => Traverse['value']} */
 Traverse.prototype.get = function (ps) {
 	var node = this.value;
-	for (var i = 0; i < ps.length; i++) {
+	for (var i = 0; node && i < ps.length; i++) {
 		var key = ps[i];
-		if (!node || !hasOwnProperty.call(node, key)) {
+		if (
+			!hasOwnProperty.call(node, key)
+			|| (!this.options.includeSymbols && typeof key === 'symbol')
+		) {
 			return void undefined;
 		}
 		node = node[key];
@@ -249,11 +266,12 @@ Traverse.prototype.get = function (ps) {
 	return node;
 };
 
+/** @type {(ps: PropertyKey[]) => boolean} */
 Traverse.prototype.has = function (ps) {
 	var node = this.value;
-	for (var i = 0; i < ps.length; i++) {
+	for (var i = 0; node && i < ps.length; i++) {
 		var key = ps[i];
-		if (!node || !hasOwnProperty.call(node, key)) {
+		if (!hasOwnProperty.call(node, key) || (!this.options.includeSymbols && typeof key === 'symbol')) {
 			return false;
 		}
 		node = node[key];
@@ -272,14 +290,12 @@ Traverse.prototype.set = function (ps, value) {
 	return value;
 };
 
-var immutableOpts = { __proto__: null, immutable: true };
-
 Traverse.prototype.map = function (cb) {
-	return walk(this.value, cb, immutableOpts);
+	return walk(this.value, cb, { __proto__: null, immutable: true, includeSymbols: !!this.options.includeSymbols });
 };
 
 Traverse.prototype.forEach = function (cb) {
-	this.value = walk(this.value, cb);
+	this.value = walk(this.value, cb, this.options);
 	return this.value;
 };
 
@@ -313,6 +329,7 @@ Traverse.prototype.nodes = function () {
 Traverse.prototype.clone = function () {
 	var parents = [];
 	var nodes = [];
+	var options = this.options;
 
 	if (whichTypedArray(this.value)) {
 		return taSlice(this.value);
@@ -326,12 +343,13 @@ Traverse.prototype.clone = function () {
 		}
 
 		if (typeof src === 'object' && src !== null) {
-			var dst = copy(src);
+			var dst = copy(src, options);
 
 			parents.push(src);
 			nodes.push(dst);
 
-			forEach(ownEnumerableKeys(src), function (key) {
+			var iteratorFunction = options.includeSymbols ? ownEnumerableKeys : objectKeys;
+			forEach(iteratorFunction(src), function (key) {
 				dst[key] = clone(src[key]);
 			});
 
@@ -345,8 +363,10 @@ Traverse.prototype.clone = function () {
 	}(this.value));
 };
 
+/** @type {(obj: object, options?: TraverseOptions) => Traverse} */
 function traverse(obj) {
-	return new Traverse(obj);
+	var options = arguments.length > 1 ? arguments[1] : emptyNull;
+	return new Traverse(obj, options);
 }
 
 // TODO: replace with object.assign?
diff --git a/test/has.js b/test/has.js
index 6802a11..fc65a0c 100644
--- a/test/has.js
+++ b/test/has.js
@@ -23,14 +23,29 @@ test('has', function (t) {
 		obj[globalSymbol][localSymbol] = 7;
 		obj[localSymbol] = 8;
 
-		st.equal(traverse(obj).has([globalSymbol]), true);
+		st.equal(traverse(obj).has([globalSymbol]), false);
+		st.equal(traverse(obj, { includeSymbols: true }).has([globalSymbol]), true);
+
 		st.equal(traverse(obj).has([globalSymbol, globalSymbol]), false);
-		st.equal(traverse(obj).has([globalSymbol, localSymbol]), true);
-		st.equal(traverse(obj).has([localSymbol]), true);
-		st.equal(traverse(obj).has([localSymbol]), true);
+		st.equal(traverse(obj, { includeSymbols: true }).has([globalSymbol, globalSymbol]), false);
+
+		st.equal(traverse(obj).has([globalSymbol, localSymbol]), false);
+		st.equal(traverse(obj, { includeSymbols: true }).has([globalSymbol, localSymbol]), true);
+
+		st.equal(traverse(obj).has([localSymbol]), false);
+		st.equal(traverse(obj, { includeSymbols: true }).has([localSymbol]), true);
+
+		st.equal(traverse(obj).has([Symbol('d')]), false);
+		st.equal(traverse(obj, { includeSymbols: true }).has([Symbol('d')]), false);
+
 		st.equal(traverse(obj).has([Symbol('e')]), false);
-		st.equal(traverse(obj).has([Symbol.for('d')]), true);
+		st.equal(traverse(obj, { includeSymbols: true }).has([Symbol('e')]), false);
+
+		st.equal(traverse(obj).has([Symbol.for('d')]), false);
+		st.equal(traverse(obj, { includeSymbols: true }).has([Symbol.for('d')]), true);
+
 		st.equal(traverse(obj).has([Symbol.for('e')]), false);
+		st.equal(traverse(obj, { includeSymbols: true }).has([Symbol.for('e')]), false);
 
 		st.end();
 	});