Intent to ship: Uint8Array to/from base64 and hex

[Daniel Minor]

As of Firefox 133, I intend to turn the `Uint8Array to/from base64 and hex` proposal implementation on by default on all platforms. It has been developed behind the `javascript.options.experimental.uint8array_base64` preference. The API shipped in Safari Tech Preview 202 (https://webkit.org/blog/15798/release-notes-for-safari-technology-preview-202/), the implementation in V8 has started (https://issues.chromium.org/issues/42204568).

Bug to turn on by default: https://bugzilla.mozilla.org/show_bug.cgi?id=1917885 is the bug to enable, and https://bugzilla.mozilla.org/show_bug.cgi?id=1862220 is the meta bug for this.

Standard: https://github.com/tc39/proposal-arraybuffer-base64

Daniel

[Nick Alexander]

Dan, others,

Amazing!  I literally have the tab still open from yesterday when I wanted this function.  (Wish I'd known about the pref!)

Best,

Nick