Much of this is supported now; T13492 has some general followup.

No current plans to pursue this.

No plans to pursue this.

No longer clear what this accomplishes.

I don't currently plan to pursue this.

This is very old and we have no outstanding customer requests for ARM support.

Also, just so I don't completely forget about it:

Changes in D17802, D17803, D17816 and D17817 all seem generally fine to me from cursory inspection. If D17819 seems sane for fixing the "huge blobs of unstable JSON" problem, let's stick them all on that, I'll take a closer look at the nodes, and we can get everything in? Good luck racing each other on minor version numbers.

The first page I found on the internet claims the iPhone 7 will be 1920x1080, so my strategy looks like it's paying off!

That seems fine to me.

I'm about to start implement full dereferencing support. Cases that are missing now:

($expr)[0];
SomeClass::BRILLIANT_CONSTANT[5];