Reuse is functions for code size

[miyaji255]

Feature Request

Reuse already created is given as an argument to reduce the code size of is for large interfaces.

Idea

Typia works without this, so I think it acceptable to have strict conditions.

• If it's not the type you're looking for, ignore it.
• Ignore variable symbols even if they do not appear.
  ex:) typia.is<User>(), validators.user
• Ignore any cases beginning with _, $.

Example

import typia from "typia";

interface User {
  name: string;
  homepage: string;
  age: number;
}

interface Comment {
  author: User;
  content: string
}

interface Article {
  author: User;
  content: string;
  comments: Comment[]
}

const isUser = typia.createIs<User>();
const isComment = typia.createIs<Comment>(isUser);
const isArticle = typia.createIs<Article>(isUser, isComment);

[samchon]

I have no idea about this way. Would you challenge about this issue?