fix(guardInstance): guard the value with object

Author: sciborrudnicki

packages/type/src/guard/lib/guard-instance.func.ts

@@ -11,5 +11,5 @@ import { ResultCallback } from '../../type/result-callback.type';
  * @param callback Optional `ResultCallback` function to handle result before returns.
  * @returns A `boolean` indicating whether or not the `value` is a `symbol`.
  */
-export const guardInstance: GuardInstance = <Obj>(value: Obj, instance: Constructor<Obj>, callback?: ResultCallback): value is Obj =>
+export const guardInstance: GuardInstance = <Obj extends object>(value: Obj, instance: Constructor<Obj>, callback?: ResultCallback): value is Obj =>
   isInstance<Obj>(value, instance, callback);

packages/type/src/guard/type/guard-instance.type.ts

@@ -1,3 +1,3 @@
 import { Constructor } from '../../type/constructor.type';
 import { ResultCallback } from '../../type/result-callback.type';
-export type GuardInstance = <Obj>(value: Obj, instance: Constructor<Obj>, callback?: ResultCallback) => value is Obj;
+export type GuardInstance = <Obj extends object>(value: Obj, instance: Constructor<Obj>, callback?: ResultCallback) => value is Obj;