From:  Jim Blandy <jblandy@mozilla.com>
Date:  10 Jun 2016 02:42:41 Hong Kong Time
Newsgroup:  news.mozilla.org/mozilla.dev.tech.js-engine.internals
Subject:  

Re: Improving Date.parse

NNTP-Posting-Host:  63.245.214.181

On Thu, Jun 9, 2016 at 5:02 AM, Mike Shaver  wrote:

> If engines pass parsing through to system libraries, it may be difficult
> for them to fully specify their quirks.
>

True; I wouldn't be surprised to see experiments assessing the impact of
specific proposals turning out to be influential.

Having things that currently fail become valid could also change the
> behaviour of existing programs that do speculative parsing; something to
> keep in mind.
>

The current behavior varies from one browser to another anyway. Assuming
the new grammar only codifies existing practice, won't any such programs
already be behaving inconsistently across browsers?