This document contains the contents of the specification as of commit f6b7862000ab405186fc4c213ce19de30cb2b649 , and should only be used as a historical reference. This commit may not have even been merged into the specification.
Do not attempt to implement this version of the specification. Do not reference this version as authoritative in any way. Instead, see https://tc39.github.io/ecma262 for the living specification.