Can't find any links in notes about this, however; ES4 did use the specifier only per [archived copy of an overview pdf](https://www.webcitation.org/5rBiWD4P6?url=http://www.ecmascript.org/es4/spec/overview.pdf)
Can't find any links in notes about this, however; ES4 did use the specifier only per archived copy of an overview pdf