chore(release): 1.21.0 [skip ci]

# [1.21.0](v1.20.1...v1.21.0) (2021-03-10) ### Features * Korean translation ([#201](#201)) ([58cc055](58cc055)), closes [#174](#174)
denysdovhan · Mar 10, 2021 · 44d0191 · 44d0191
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diff --git a/README-kr.md b/README-kr.md
@@ -45,67 +45,67 @@ $ npm install -g wtfjs
 <!-- prettier-ignore-start -->
 <!-- START doctoc generated TOC please keep comment here to allow auto update -->
 <!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
-# 목차
-
-- [💪🏻 시작하기에 앞서](#-motivation)
-- [✍🏻 표기법](#-notation)
-- [👀 예제](#-examples)
-  - [`[]`와 `![]`은 같다](#-is-equal-)
-  - [`true`는 `![]`와 같지 않지만, `[]` 이와도 같지 않다](#true-is-not-equal--but-not-equal--too)
-  - [true는 false이다](#true-is-false)
+# Table of Contents
+
+- [💪🏻 시작하기에 앞서](#-%EC%8B%9C%EC%9E%91%ED%95%98%EA%B8%B0%EC%97%90-%EC%95%9E%EC%84%9C)
+- [✍🏻 표기법](#-%ED%91%9C%EA%B8%B0%EB%B2%95)
+- [👀 예제](#-%EC%98%88%EC%A0%9C)
+  - [`[]`와 `![]은 같다`](#%EC%99%80-%EC%9D%80-%EA%B0%99%EB%8B%A4)
+  - [`true`는 `![]`와 같지 않지만, `[]` 이와도 같지 않다](#true%EB%8A%94-%EC%99%80-%EA%B0%99%EC%A7%80-%EC%95%8A%EC%A7%80%EB%A7%8C--%EC%9D%B4%EC%99%80%EB%8F%84-%EA%B0%99%EC%A7%80-%EC%95%8A%EB%8B%A4)
+  - [true 은 false](#true-%EC%9D%80-false)
   - [baNaNa](#banana)
-  - [`NaN`은 `NaN`이 아니다](#nan-is-not-a-nan)
-  - [이것은 실패다](#its-a-fail)
-  - [`[]`은 truthy이지만 `true`은 아니다](#-is-truthy-but-not-true)
-  - [`null`은 falsy이지만 `false`은 아니다](#null-is-falsy-but-not-false)
-  - [`document.all`은 객체이지만 정의되지 않았다](#documentall-is-an-object-but-it-is-undefined)
-  - [최소 값은 0보다 크다](#minimal-value-is-greater-than-zero)
-  - [함수는 함수가 아니다](#function-is-not-a-function)
-  - [배열 추가](#adding-arrays)
-  - [배열에서 후행 ](#trailing-commas-in-array)
-  - [배열 평등은 ](#array-equality-is-a-monster)
-  - [`undefined`과 `Number`](#undefined-and-number)
-  - [`parseInt`은 나쁜 놈이다](#parseint-is-a-bad-guy)
-  - [`true`와 `false`를 이용한 수학](#math-with-true-and-false)
-  - [HTML 주석은 JavaScript에서도 유효하다](#html-comments-are-valid-in-javascript)
-  - [`NaN`은 숫자가 아니다](#nan-is-not-a-number)
-  - [`[]`과 `null`은 객체이다](#-and-null-are-objects)
-  - [마법처럼 증가하는 숫자](#magically-increasing-numbers)
-  - [정확도 `0.1 + 0.2`](#precision-of-01--02)
-  - [패치 번호](#patching-numbers)
-  - [세 숫자의 비교](#comparison-of-three-numbers)
-  - [재미있는 수학](#funny-math)
-  - [RegExps 추가](#addition-of-regexps)
-  - [문자열은 `String`의 인스턴스가 아니다](#strings-arent-instances-of-string)
-  - [backticks으로 함수 호출](#calling-functions-with-backticks)
+  - [`NaN`은 `NaN`이 아니다](#nan%EC%9D%80-nan%EC%9D%B4-%EC%95%84%EB%8B%88%EB%8B%A4)
+  - [이것은 실패다](#%EC%9D%B4%EA%B2%83%EC%9D%80-%EC%8B%A4%ED%8C%A8%EB%8B%A4)
+  - [`[]`은 truthy 이지만 `true`는 아니다](#%EC%9D%80-truthy-%EC%9D%B4%EC%A7%80%EB%A7%8C-true%EB%8A%94-%EC%95%84%EB%8B%88%EB%8B%A4)
+  - [`null`은 falsy 이지만 `false`은 아니다](#null%EC%9D%80-falsy-%EC%9D%B4%EC%A7%80%EB%A7%8C-false%EC%9D%80-%EC%95%84%EB%8B%88%EB%8B%A4)
+  - [`document.all`은 객체이지만 `undefined` 이다](#documentall%EC%9D%80-%EA%B0%9D%EC%B2%B4%EC%9D%B4%EC%A7%80%EB%A7%8C-undefined-%EC%9D%B4%EB%8B%A4)
+  - [최소 값은 0 보다 크다](#%EC%B5%9C%EC%86%8C-%EA%B0%92%EC%9D%80-0-%EB%B3%B4%EB%8B%A4-%ED%81%AC%EB%8B%A4)
+  - [함수는 함수가 아니다](#%ED%95%A8%EC%88%98%EB%8A%94-%ED%95%A8%EC%88%98%EA%B0%80-%EC%95%84%EB%8B%88%EB%8B%A4)
+  - [배열 추가](#%EB%B0%B0%EC%97%B4-%EC%B6%94%EA%B0%80)
+  - [배열의 후행 쉼표](#%EB%B0%B0%EC%97%B4%EC%9D%98-%ED%9B%84%ED%96%89-%EC%89%BC%ED%91%9C)
+  - [배열 평등은 몬스터](#%EB%B0%B0%EC%97%B4-%ED%8F%89%EB%93%B1%EC%9D%80-%EB%AA%AC%EC%8A%A4%ED%84%B0)
+  - [`undefined`과 `Number`](#undefined%EA%B3%BC-number)
+  - [`parseInt`은 나쁜 놈이다](#parseint%EC%9D%80-%EB%82%98%EC%81%9C-%EB%86%88%EC%9D%B4%EB%8B%A4)
+  - [`true`와 `false`를 이용한 수학](#true%EC%99%80-false%EB%A5%BC-%EC%9D%B4%EC%9A%A9%ED%95%9C-%EC%88%98%ED%95%99)
+  - [HTML 주석은 JavaScript 에서도 유효하다](#html-%EC%A3%BC%EC%84%9D%EC%9D%80-javascript-%EC%97%90%EC%84%9C%EB%8F%84-%EC%9C%A0%ED%9A%A8%ED%95%98%EB%8B%A4)
+  - [`NaN`은 숫자가 아니다](#nan%EC%9D%80-%EC%88%AB%EC%9E%90%EA%B0%80-%EC%95%84%EB%8B%88%EB%8B%A4)
+  - [`[]`과 `null`은 객체이다](#%EA%B3%BC-null%EC%9D%80-%EA%B0%9D%EC%B2%B4%EC%9D%B4%EB%8B%A4)
+  - [마법처럼 증가하는 숫자](#%EB%A7%88%EB%B2%95%EC%B2%98%EB%9F%BC-%EC%A6%9D%EA%B0%80%ED%95%98%EB%8A%94-%EC%88%AB%EC%9E%90)
+  - [정확도 `0.1 + 0.2`](#%EC%A0%95%ED%99%95%EB%8F%84-01--02)
+  - [패치 번호](#%ED%8C%A8%EC%B9%98-%EB%B2%88%ED%98%B8)
+  - [세 숫자의 비교](#%EC%84%B8-%EC%88%AB%EC%9E%90%EC%9D%98-%EB%B9%84%EA%B5%90)
+  - [재미있는 수학](#%EC%9E%AC%EB%AF%B8%EC%9E%88%EB%8A%94-%EC%88%98%ED%95%99)
+  - [RegExps 추가](#regexps-%EC%B6%94%EA%B0%80)
+  - [문자열은 `String`의 인스턴스가 아니다](#%EB%AC%B8%EC%9E%90%EC%97%B4%EC%9D%80-string%EC%9D%98-%EC%9D%B8%EC%8A%A4%ED%84%B4%EC%8A%A4%EA%B0%80-%EC%95%84%EB%8B%88%EB%8B%A4)
+  - [backticks 으로 함수 호출](#backticks-%EC%9C%BC%EB%A1%9C-%ED%95%A8%EC%88%98-%ED%98%B8%EC%B6%9C)
   - [Call call call](#call-call-call)
-  - [`constructor` 속성](#a-constructor-property)
-  - [객체 속성의 키로서의 객체](#object-as-a-key-of-objects-property)
-  - [`__proto__`을 사용한 프로토 타입 접근](#accessing-prototypes-with-__proto__)
+  - [`constructor` 속성](#constructor-%EC%86%8D%EC%84%B1)
+  - [객체 속성의 키로서의 객체](#%EA%B0%9D%EC%B2%B4-%EC%86%8D%EC%84%B1%EC%9D%98-%ED%82%A4%EB%A1%9C%EC%84%9C%EC%9D%98-%EA%B0%9D%EC%B2%B4)
+  - [`__proto__`을 사용한 프로토 타입 접근](#__proto__%EC%9D%84-%EC%82%AC%EC%9A%A9%ED%95%9C-%ED%94%84%EB%A1%9C%ED%86%A0-%ED%83%80%EC%9E%85-%EC%A0%91%EA%B7%BC)
   - [`` `${{Object}}` ``](#-object-)
-  - [디폴트 값으로 구조 해제](#destructuring-with-default-values)
-  - [Dots과 spreading](#dots-and-spreading)
-  - [라벨](#labels)
-  - [중첩 라벨](#nested-labels)
-  - [교활한 `try..catch`](#insidious-trycatch)
-  - [이것은 다중 상속인가?](#is-this-multiple-inheritance)
-  - [A generator which yields itself](#a-generator-which-yields-itself)
-  - [클래스의 클래스](#a-class-of-class)
-  - [강제 할 수 없는 객체](#non-coercible-objects)
-  - [까다로운 화살표 함수](#tricky-arrow-functions)
-  - [화살표 함수는 생성자가 될 수 없다](#arrow-functions-can-not-be-a-constructor)
-  - [`arguments`과 화살표 함수](#arguments-and-arrow-functions)
-  - [까다로운 return](#tricky-return)
-  - [객체에 할당 연결](#chaining-assignments-on-object)
-  - [배열을 사용한 객체 속성 엑세스](#accessing-object-properties-with-arrays)
-  - [Null 및 관계 연산자](#null-and-relational-operators)
-  - [`Number.toFixed()` 다른 숫자 표시](#numbertofixed-display-different-numbers)
-  - [`Math.max()` 이하 `Math.min()`](#mathmax-less-than-mathmin)
-  - [`null`과 `0` 비교](#comparing-null-to-0)
-  - [동일한 변수 재 선언](#same-variable-redeclaration)
-  - [디폴트 동작 Array.prototype.sort()](#default-behavior-arrayprototypesort)
-  - [resolve()은 Promise instance를 반환하지 않는다](#resolve-wont-return-promise-instance)
-- [📚 기타 resources](#-other-resources)
+  - [디폴트 값으로 구조 해제](#%EB%94%94%ED%8F%B4%ED%8A%B8-%EA%B0%92%EC%9C%BC%EB%A1%9C-%EA%B5%AC%EC%A1%B0-%ED%95%B4%EC%A0%9C)
+  - [Dots 과 spreading](#dots-%EA%B3%BC-spreading)
+  - [라벨](#%EB%9D%BC%EB%B2%A8)
+  - [중첩된 라벨들](#%EC%A4%91%EC%B2%A9%EB%90%9C-%EB%9D%BC%EB%B2%A8%EB%93%A4)
+  - [교활한 `try..catch`](#%EA%B5%90%ED%99%9C%ED%95%9C-trycatch)
+  - [이것은 다중 상속인가?](#%EC%9D%B4%EA%B2%83%EC%9D%80-%EB%8B%A4%EC%A4%91-%EC%83%81%EC%86%8D%EC%9D%B8%EA%B0%80)
+  - [스스로 생성되는 Generator](#%EC%8A%A4%EC%8A%A4%EB%A1%9C-%EC%83%9D%EC%84%B1%EB%90%98%EB%8A%94-generator)
+  - [클래스의 클래스](#%ED%81%B4%EB%9E%98%EC%8A%A4%EC%9D%98-%ED%81%B4%EB%9E%98%EC%8A%A4)
+  - [강제할 수 없는 객체](#%EA%B0%95%EC%A0%9C%ED%95%A0-%EC%88%98-%EC%97%86%EB%8A%94-%EA%B0%9D%EC%B2%B4)
+  - [까다로운 화살표 함수](#%EA%B9%8C%EB%8B%A4%EB%A1%9C%EC%9A%B4-%ED%99%94%EC%82%B4%ED%91%9C-%ED%95%A8%EC%88%98)
+  - [화살표 함수는 생성자가 될 수 없다](#%ED%99%94%EC%82%B4%ED%91%9C-%ED%95%A8%EC%88%98%EB%8A%94-%EC%83%9D%EC%84%B1%EC%9E%90%EA%B0%80-%EB%90%A0-%EC%88%98-%EC%97%86%EB%8B%A4)
+  - [`arguments`와 화살표 함수](#arguments%EC%99%80-%ED%99%94%EC%82%B4%ED%91%9C-%ED%95%A8%EC%88%98)
+  - [까다로운 return](#%EA%B9%8C%EB%8B%A4%EB%A1%9C%EC%9A%B4-return)
+  - [객체에 할당 연결](#%EA%B0%9D%EC%B2%B4%EC%97%90-%ED%95%A0%EB%8B%B9-%EC%97%B0%EA%B2%B0)
+  - [배열을 사용한 객체 속성 접근 s](#%EB%B0%B0%EC%97%B4%EC%9D%84-%EC%82%AC%EC%9A%A9%ED%95%9C-%EA%B0%9D%EC%B2%B4-%EC%86%8D%EC%84%B1-%EC%A0%91%EA%B7%BC-s)
+  - [Null 및 관계 연산자](#null-%EB%B0%8F-%EA%B4%80%EA%B3%84-%EC%97%B0%EC%82%B0%EC%9E%90)
+  - [`Number.toFixed()` 다른 숫자 표시](#numbertofixed-%EB%8B%A4%EB%A5%B8-%EC%88%AB%EC%9E%90-%ED%91%9C%EC%8B%9C)
+  - [`Math.max()` 이하 `Math.min()`](#mathmax-%EC%9D%B4%ED%95%98-mathmin)
+  - [`null`과 `0` 비교](#null%EA%B3%BC-0-%EB%B9%84%EA%B5%90)
+  - [동일한 변수 재선언](#%EB%8F%99%EC%9D%BC%ED%95%9C-%EB%B3%80%EC%88%98-%EC%9E%AC%EC%84%A0%EC%96%B8)
+  - [디폴트 동작 Array.prototype.sort()](#%EB%94%94%ED%8F%B4%ED%8A%B8-%EB%8F%99%EC%9E%91-arrayprototypesort)
+  - [resolve()은 Promise instance 를 반환하지 않는다](#resolve%EC%9D%80-promise-instance-%EB%A5%BC-%EB%B0%98%ED%99%98%ED%95%98%EC%A7%80-%EC%95%8A%EB%8A%94%EB%8B%A4)
+- [📚 기타 resources](#-%EA%B8%B0%ED%83%80-resources)
 - [🎓 License](#-license)
 
 <!-- END doctoc generated TOC please keep comment here to allow auto update -->

diff --git a/README.md b/README.md
@@ -51,93 +51,76 @@ Currently, there are these translations of **wtfjs**:
 <!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
 # Table of Contents
 
-- [What the f\*ck JavaScript?](#what-the-fck-javascript)
-- [Node Packaged Manuscript](#node-packaged-manuscript)
-- [Translations](#translations)
-- [Table of Contents](#table-of-contents)
 - [💪🏻 Motivation](#-motivation)
 - [✍🏻 Notation](#-notation)
 - [👀 Examples](#-examples)
   - [`[]` is equal `![]`](#-is-equal-)
-    - [💡 Explanation:](#-explanation)
   - [`true` is not equal `![]`, but not equal `[]` too](#true-is-not-equal--but-not-equal--too)
-    - [💡 Explanation:](#-explanation-1)
   - [true is false](#true-is-false)
-    - [💡 Explanation:](#-explanation-2)
   - [baNaNa](#banana)
-    - [💡 Explanation:](#-explanation-3)
   - [`NaN` is not a `NaN`](#nan-is-not-a-nan)
-    - [💡 Explanation:](#-explanation-4)
   - [`Object.is()` and `===` weird cases](#objectis-and--weird-cases)
-    - [💡 Explanation:](#-explanation-5)
   - [It's a fail](#its-a-fail)
-    - [💡 Explanation:](#-explanation-6)
   - [`[]` is truthy, but not `true`](#-is-truthy-but-not-true)
-    - [💡 Explanation:](#-explanation-7)
   - [`null` is falsy, but not `false`](#null-is-falsy-but-not-false)
-    - [💡 Explanation:](#-explanation-8)
   - [`document.all` is an object, but it is undefined](#documentall-is-an-object-but-it-is-undefined)
-    - [💡 Explanation:](#-explanation-9)
   - [Minimal value is greater than zero](#minimal-value-is-greater-than-zero)
-    - [💡 Explanation:](#-explanation-10)
   - [function is not a function](#function-is-not-a-function)
-    - [💡 Explanation:](#-explanation-11)
-    - [Super constructor null of Foo is not a constructor](#super-constructor-null-of-foo-is-not-a-constructor)
-    - [💡 Explanation:](#-explanation-12)
   - [Adding arrays](#adding-arrays)
-    - [💡 Explanation:](#-explanation-13)
   - [Trailing commas in array](#trailing-commas-in-array)
-    - [💡 Explanation:](#-explanation-14)
   - [Array equality is a monster](#array-equality-is-a-monster)
-    - [💡 Explanation:](#-explanation-15)
   - [`undefined` and `Number`](#undefined-and-number)
-    - [💡 Explanation:](#-explanation-16)
   - [`parseInt` is a bad guy](#parseint-is-a-bad-guy)
   - [Math with `true` and `false`](#math-with-true-and-false)
-    - [💡 Explanation:](#-explanation-17)
   - [HTML comments are valid in JavaScript](#html-comments-are-valid-in-javascript)
-    - [💡 Explanation:](#-explanation-18)
+  - [`NaN` is ~~not~~ a number](#nan-is-not-a-number)
+  - [`[]` and `null` are objects](#-and-null-are-objects)
+  - [Magically increasing numbers](#magically-increasing-numbers)
+  - [Precision of `0.1 + 0.2`](#precision-of-01--02)
+  - [Patching numbers](#patching-numbers)
+  - [Comparison of three numbers](#comparison-of-three-numbers)
+  - [Funny math](#funny-math)
+  - [Addition of RegExps](#addition-of-regexps)
+  - [Strings aren't instances of `String`](#strings-arent-instances-of-string)
+  - [Calling functions with backticks](#calling-functions-with-backticks)
+  - [Call call call](#call-call-call)
+  - [A `constructor` property](#a-constructor-property)
+  - [Object as a key of object's property](#object-as-a-key-of-objects-property)
+  - [Accessing prototypes with `__proto__`](#accessing-prototypes-with-__proto__)
+  - [`` `${{Object}}` ``](#-object-)
+  - [Destructuring with default values](#destructuring-with-default-values)
+  - [Dots and spreading](#dots-and-spreading)
+  - [Labels](#labels)
+  - [Nested labels](#nested-labels)
+  - [Insidious `try..catch`](#insidious-trycatch)
+  - [Is this multiple inheritance?](#is-this-multiple-inheritance)
+  - [A generator which yields itself](#a-generator-which-yields-itself)
+  - [A class of class](#a-class-of-class)
+  - [Non-coercible objects](#non-coercible-objects)
+  - [Tricky arrow functions](#tricky-arrow-functions)
+  - [Arrow functions can not be a constructor](#arrow-functions-can-not-be-a-constructor)
+  - [`arguments` and arrow functions](#arguments-and-arrow-functions)
+  - [Tricky return](#tricky-return)
   - [Chaining assignments on object](#chaining-assignments-on-object)
-    - [💡 Explanation:](#-explanation-19)
   - [Accessing object properties with arrays](#accessing-object-properties-with-arrays)
-    - [💡 Explanation:](#-explanation-20)
   - [Null and Relational Operators](#null-and-relational-operators)
-    - [💡 Explanation:](#-explanation-21)
   - [`Number.toFixed()` display different numbers](#numbertofixed-display-different-numbers)
-    - [💡 Explanation:](#-explanation-22)
   - [`Math.max()` less than `Math.min()`](#mathmax-less-than-mathmin)
-    - [💡 Explanation:](#-explanation-23)
   - [Comparing `null` to `0`](#comparing-null-to-0)
-    - [💡 Explanation:](#-explanation-24)
   - [Same variable redeclaration](#same-variable-redeclaration)
-    - [💡 Explanation:](#-explanation-25)
   - [Default behavior Array.prototype.sort()](#default-behavior-arrayprototypesort)
-    - [💡 Explanation:](#-explanation-26)
-    - [Hint](#hint)
   - [resolve() won't return Promise instance](#resolve-wont-return-promise-instance)
-    - [💡 Explanation:](#-explanation-27)
   - [`{}{}` is undefined](#-is-undefined)
-    - [💡 Explanation:](#-explanation-28)
   - [`min` is greater than `max`](#min-is-greater-than-max)
-    - [💡 Explanation:](#-explanation-29)
   - [`arguments` binding](#arguments-binding)
-    - [💡 Explanation:](#-explanation-30)
   - [An `alert` from hell](#an-alert-from-hell)
-    - [💡 Explanation:](#-explanation-31)
   - [An infinite timeout](#an-infinite-timeout)
-    - [💡 Explanation:](#-explanation-32)
   - [Double dot](#double-dot)
-    - [💡 Explanation:](#-explanation-33)
   - [Extra Newness](#extra-newness)
-    - [💡 Explanation:](#-explanation-34)
   - [Why you should use semicolons](#why-you-should-use-semicolons)
-    - [💡 Explanation:](#-explanation-35)
   - [Split a string by a space](#split-a-string-by-a-space)
-    - [💡 Explanation:](#-explanation-36)
   - [A stringified string](#a-stringified-string)
-    - [💡 Explanation:](#-explanation-37)
   - [Non-strict comparison of a number to `true`](#non-strict-comparison-of-a-number-to-true)
-    - [💡 Explanation:](#-explanation-38)
 - [📚 Other resources](#-other-resources)
 - [🤝 Supporting](#-supporting)
 - [🎓 License](#-license)

diff --git a/package-lock.json b/package-lock.json
diff --git a/package.json b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "wtfjs",
-  "version": "1.20.1",
+  "version": "1.21.0",
   "description": "A list of funny and tricky JavaScript examples",
   "bin": {
     "wtfjs": "wtfjs.js"