fix: isPlainObject: add quick comparison between input and Object to short-circuit taxing Function.toString invocations (#805)

Author: benelliott

src/utils/common.ts

@@ -46,6 +46,10 @@ export function isPlainObject(value: any): boolean {
 }
 const Ctor =
 Object.hasOwnProperty.call(proto, "constructor") && proto.constructor
+
+if (Ctor === Object)
+return true
+
 return (
 typeof Ctor == "function" &&
 Function.toString.call(Ctor) === objectCtorString