fix(core-extensions): Apply mapKeys only to plain objects

packages/core-extensions/src/object/map-keys.f.ts

@@ -3,8 +3,8 @@ import type { MappedKeys } from '@/internal/mapped-keys.type.js'
 function isRecord(item: any): item is Record<string, any> {
 	const isNotNull = item != null
 	const isObject = typeof item === 'object'
-	const isNotAnArray = !Array.isArray(item)
-	return isNotNull && isNotAnArray && isObject
+	const isPlainObject = isNotNull && isObject && Object.getPrototypeOf(item) === Object.prototype
+	return isPlainObject
 }
 
 function mapKeysInArrayItems<T extends any[], R extends string>(arr: T, transform: (key: string) => R) {

packages/core-extensions/src/object/map-keys.test.ts

@@ -39,17 +39,20 @@ describe('mapKeys', () => {
 
 	it('maps keys with unusual values', async () => {
 		const func = () => 1
+		const date = new Date()
 		const obj = {
 			a: func,
 			b: undefined,
-			c: null
+			c: null,
+			d: date
 		}
 		const result = mapKeys(obj, (key) => `${key}_`)
 
 		expect(result).toEqual({
 			a_: func,
 			b_: undefined,
-			c_: null
+			c_: null,
+			d_: date
 		})
 	})
 })