This documents provides documentation about special cases you will find if you play with raw data.
https://github.com/typestack/class-transformer/blob/a650d9f490573443f62508bc063b857bcd5e2525/src/ClassTransformer.ts#L29-L31
https://www.whitesourcesoftware.com/vulnerability-database/CVE-2020-28274,https://github.com/isaymatato/deepref/commit/24935e6a1060cb09c641d3075982f0b44cfca4c2