ES3.1 Draft: 11 June 2008 version available

[Sam Ruby]

I'm trying to understand the nature of the ES3.1 - ES4 subset
relationship that this committee has agreed to.

> p69 12.10.  Disallowing the with statement in strict mode breaks the
> ES3.1 - ES4 subset relationship (we've found no compelling reason to
> ban it).

How does having ES4 support *more* than ES3.1 supports break the
subset relationship?

- Sam Ruby