On 07/20/2017 03:08 AM, Alexander Jones wrote:
Removing things also frees up syntax and names for future extensions.
Never removing features is simply unscalable, and it's only going to
accelerate JS's demise!
I still think version pragmas are probably worth exploring to mitigate
this, while not 'breaking the web' is a stated goal.
Not breaking the web is a stated goal.
A non-web embedding is free to remove whatever is unwanted, but the vast
majority of resources are put into JS engines that run the web, so in
practice you're going to run on engines that implement the whole spec
and are not at all eager to pay for testing or maintenance overhead for
non-web configurations.
Features can sometimes be usefully deprecated by not implementing them
in optimizing JITs. (For example, 'with'.) Whatever invariants the
features break must still be handled by the overall engine, but it's
usually much easier to only handle things on slow paths.
Version pragmas have been explored and found to be a bad idea. See
http://exploringjs.com/es6/ch_one-javascript.html for a far better
description than I would be able to produce.
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