Remove propertyIsEnumerable() (#26)

Co-authored-by: Sindre Sorhus <sindresorhus@gmail.com>

Author: ehmicky

index.js

@@ -3,18 +3,18 @@ export function includeKeys(object, predicate) {
 
 	if (Array.isArray(predicate)) {
 		for (const key of predicate) {
-			if (isEnumerable.call(object, key)) {
-				const descriptor = Object.getOwnPropertyDescriptor(object, key);
+			const descriptor = Object.getOwnPropertyDescriptor(object, key);
+			if (descriptor?.enumerable) {
 				Object.defineProperty(result, key, descriptor);
 			}
 		}
 	} else {
-		// `for ... of Reflect.ownKeys()` is faster than `for ... of Object.entries()`.
+		// `Reflect.ownKeys()` is required to retrieve symbol properties
 		for (const key of Reflect.ownKeys(object)) {
-			if (isEnumerable.call(object, key)) {
+			const descriptor = Object.getOwnPropertyDescriptor(object, key);
+			if (descriptor.enumerable) {
 				const value = object[key];
 				if (predicate(key, value, object)) {
-					const descriptor = Object.getOwnPropertyDescriptor(object, key);
 					Object.defineProperty(result, key, descriptor);
 				}
 			}
@@ -24,8 +24,6 @@ export function includeKeys(object, predicate) {
 	return result;
 }
 
-const {propertyIsEnumerable: isEnumerable} = Object.prototype;
-
 export function excludeKeys(object, predicate) {
 	if (Array.isArray(predicate)) {
 		const set = new Set(predicate);