fix: doctest linter

PR-URL: #9234
Reviewed-by: Athan Reines <kgryte@gmail.com>

Author: Orthodox-64

lib/node_modules/@stdlib/_tools/doctest/compare-values/lib/main.js

@@ -435,6 +435,9 @@ function checkArray( actual, expected ) {
 					return false;
 				}
 			} else if ( isPrimitive( a ) ) {
+				if ( !isPrimitive( b ) ) {
+					return false;
+				}
 				b = String( b );
 				if ( !checkPrimitive( a, b ) ) {
 					return false;

lib/node_modules/@stdlib/_tools/doctest/compare-values/test/test.js

@@ -611,3 +611,55 @@ tape( 'the function compares a function and a corresponding return annotation',
 		return x;
 	}
 });
+
+tape( 'the function detects a mismatch when an actual array element is a primitive and the expected array element is an array', function test( t ) {
+	var expected;
+	var actual;
+	var msg;
+
+	actual = [ 300, 700 ];
+	expected = '[[ 300, 700 ]]';
+	msg = 'Displayed return value is `[[ 300, 700 ]]`, but expected `[ 300, 700 ]` instead';
+	t.strictEqual( compareValues( actual, expected ), msg, 'returns expected message' );
+
+	t.end();
+});
+
+tape( 'the function detects a mismatch when an actual array element is a primitive and the expected array element is an object', function test( t ) {
+	var expected;
+	var actual;
+	var msg;
+
+	actual = [ 1 ];
+	expected = '[ {} ]';
+	msg = 'Displayed return value is `[ {} ]`, but expected `[ 1 ]` instead';
+	t.strictEqual( compareValues( actual, expected ), msg, 'returns expected message' );
+
+	t.end();
+});
+
+tape( 'the function detects a mismatch when an actual array element is a primitive and the expected array element is a RegExp', function test( t ) {
+	var expected;
+	var actual;
+	var msg;
+
+	actual = [ 1 ];
+	expected = '[ /abc/ ]';
+	msg = 'Displayed return value is `[ /abc/ ]`, but expected `[ 1 ]` instead';
+	t.strictEqual( compareValues( actual, expected ), msg, 'returns expected message' );
+
+	t.end();
+});
+
+tape( 'the function detects a mismatch in a mixed array where a primitive corresponds to an array', function test( t ) {
+	var expected;
+	var actual;
+	var msg;
+
+	actual = [ 1, 2 ];
+	expected = '[ 1, [ 2 ] ]';
+	msg = 'Displayed return value is `[ 1, [ 2 ] ]`, but expected `[ 1, 2 ]` instead';
+	t.strictEqual( compareValues( actual, expected ), msg, 'returns expected message' );
+
+	t.end();
+});