hopefully some optimizations

src/add.js

@@ -1,6 +1,10 @@
-import { handlers, defaultHandler } from './handlers.js'
+import { handlers, withDefaultHandler } from './handlers.js'
 
-export let add = (...classes) => addCustom(...classes, defaultHandler)
+export let add = (...classes) => {
+	for (let Class of classes) {
+		withDefaultHandler.add(Class.prototype)
+	}
+}
 
 export let addCustom = (...classes) => {
 	let handler = classes.pop()

src/handlers.js

@@ -1,30 +1,10 @@
-import { compareSymbols } from './compareSymbols.js'
-
 export let handlers = new Map()
+export let withDefaultHandler = new Set([Array.prototype, Object.prototype, null])
 
-let OBJECT_START = {}
-let OBJECT_END = {}
 let REGEXP = {}
 let DATE = {}
 let BUFFER = {}
 
-export let defaultHandler = (obj, push, recurse) => {
-	push(OBJECT_START, Object.getPrototypeOf(obj))
-	for (let property of Object.getOwnPropertyNames(obj)
-		.sort()
-		.concat(Object.getOwnPropertySymbols(obj).sort(compareSymbols))) {
-		push(property)
-		recurse(obj[property])
-	}
-	push(OBJECT_END)
-}
-
-handlers.set(Array.prototype, defaultHandler)
-
-handlers.set(Object.prototype, defaultHandler)
-
-handlers.set(null, defaultHandler)
-
 handlers.set(RegExp.prototype, (obj, push) => push(REGEXP, obj.toString()))
 
 handlers.set(Date.prototype, (obj, push) => push(DATE, obj.getTime()))

src/keys.js

@@ -1,11 +1,27 @@
-import { handlers } from './handlers.js'
+import { handlers, withDefaultHandler } from './handlers.js'
+import { compareSymbols } from './compareSymbols.js'
+
+let OBJECT_START = {}
+let OBJECT_END = {}
 
 let array = []
 let push = array.push.bind(array)
 
 let recurse = obj => {
 	if (typeof obj === 'object' && obj !== null) {
-		let handler = handlers.get(Object.getPrototypeOf(obj))
+		let prototype = Object.getPrototypeOf(obj)
+		if (withDefaultHandler.has(prototype)) {
+			push(OBJECT_START, prototype)
+			for (let property of Object.getOwnPropertyNames(obj)
+				.sort()
+				.concat(Object.getOwnPropertySymbols(obj).sort(compareSymbols))) {
+				push(property)
+				recurse(obj[property])
+			}
+			push(OBJECT_END)
+			return
+		}
+		let handler = handlers.get(prototype)
 		if (handler) {
 			handler(obj, push, recurse)
 			return