diff --git a/src/diff.js b/src/diff.js
index 67b7f48..f83d2d9 100644
--- a/src/diff.js
+++ b/src/diff.js
@@ -192,13 +192,28 @@ export function stringify(input) {
 }
 
 export function compare(input, expect) {
-	if (Array.isArray(expect)) return arrays(input, expect);
-	if (expect instanceof RegExp) return chars(''+input, ''+expect);
+	if (Array.isArray(expect) && Array.isArray(input)) return arrays(input, expect);
+	if (expect instanceof RegExp) {
+		try {
+			return chars(''+input, ''+expect);
+		} catch (e) {
+			if (e.message !== 'Cannot convert object to primitive value') {
+				throw e
+			}
+		}
+	}
 
-	if (expect && typeof expect == 'object') {
-		input = stringify(sort(input, expect));
+	let inputIsObject = input && typeof input === 'object'
+	let expectIsObject = expect && typeof expect == 'object'
+	if (expectIsObject && inputIsObject) {
+		input = sort(input, expect);
+	}
+	if (expectIsObject) {
 		expect = stringify(expect);
 	}
+	if (inputIsObject) {
+		input = stringify(input);
+	}
 
 	let isA = typeof input == 'string';
 	let isB = typeof expect == 'string';
diff --git a/test/diff.js b/test/diff.js
index cfad843..1750ad2 100644
--- a/test/diff.js
+++ b/test/diff.js
@@ -923,6 +923,35 @@ compare('should handle multi-line string against non-type mismatch', () => {
 	);
 });
 
+compare('should not fail when comparing different types', () => {
+	const values = [
+		true,
+		false,
+		null,
+		undefined,
+		{foo: 'bar'},
+		[],
+		new Date(),
+		'str',
+		1,
+		NaN,
+		Infinity,
+		/abc/,
+		function () {},
+		new Promise(() => {}),
+		$,
+	];
+	for (const val1 of values) {
+		for (const val2 of values) {
+			let aType = Object.prototype.toString.call(val1)
+			aType = aType.substring(8, aType.length - 1)
+			let bType = Object.prototype.toString.call(val2)
+			bType = bType.substring(8, bType.length - 1)
+			assert.not.throws(() => $.compare(val1, val2), `${aType} is not comparable to ${bType}`)
+		}
+	}
+});
+
 compare.run();
 
 // ---