Version 1.63.90
---------------

- New JS API: The GObject module has gained new overrides:
  GObject.signal_handler_find(), GObject.signal_handlers_block_matched(),
  GObject.signal_handlers_unblock_matched(), and
  GObject.signal_handlers_disconnect_matched(). These overrides replace the
  corresponding C API, which was not idiomatic for JavaScript and was not fully
  functional because it used bare C pointers for some of its functionality.
  See modules/overrides/GObject.js for API documentation.

- New JavaScript features! This version of GJS is based on SpiderMonkey 68, an
  upgrade from the previous ESR (Extended Support Release) of SpiderMonkey 60.
  Here are the highlights of the new JavaScript features.
  For more information, look them up on MDN or devdocs.io.

  * New language features
    + The BigInt type, currently a stage 3 proposal in the ES standard, is now
      available.

  * New syntax
    + `globalThis` is now the ES-standard supported way to get the global
      object, no matter what kind of JS environment. The old way, `window`, will
      still work, but is no longer preferred.
    + BigInt literals are expressed by a number with "n" appended to it: for
      example, `1n`, `9007199254740992n`.

  * New APIs
    + String.prototype.trimStart() and String.prototype.trimEnd() now exist and
      are preferred instead of trimLeft() and trimRight() which are nonstandard.
    + String.prototype.matchAll() allows easier access to regex capture groups.
    + Array.prototype.flat() flattens nested arrays, well-known from lodash and
      similar libraries.
    + Array.prototype.flatMap() acts like a reverse filter(), allowing adding
      elements to an array while iterating functional-style.
    + Object.fromEntries() creates an object from iterable key-value pairs.
    + Intl.RelativeTimeFormat is useful for formatting time differences into
      human-readable strings such as "1 day ago".
    + BigInt64Array and BigUint64Array are two new typed array types.

  * New behaviour
    + There are a lot of minor behaviour changes as SpiderMonkey's JS
      implementation conforms ever closer to existing ECMAScript standards and
      adopts new ones. For complete information, read the Firefox developer
      release notes:
      https://developer.mozilla.org/en-US/Firefox/Releases/61#JavaScript
      https://developer.mozilla.org/en-US/Firefox/Releases/62#JavaScript
      https://developer.mozilla.org/en-US/Firefox/Releases/63#JavaScript
      https://developer.mozilla.org/en-US/Firefox/Releases/64#JavaScript
      https://developer.mozilla.org/en-US/Firefox/Releases/65#JavaScript
      https://developer.mozilla.org/en-US/Firefox/Releases/66#JavaScript
      https://developer.mozilla.org/en-US/Firefox/Releases/67#JavaScript
      https://developer.mozilla.org/en-US/Firefox/Releases/68#JavaScript

  * Backwards-incompatible changes
    + The nonstandard String generics were removed. These had only ever been
      implemented by Mozilla and never made it into a standard. (An example of a
      String generic is calling a string method on something that might not be a
      string like this: `String.endsWith(foo, 5)`. The proper way is
      `String.prototype.endsWith.call(foo, 5)` or converting `foo` to a string.)
      This should not pose much of a problem for existing code, since in the
      previous version these would already print a deprecation warning whenever
      they were used.
      You can use `moz68tool` from mozjs-deprecation-tools
      (https://gitlab.gnome.org/ptomato/moz60tool) to scan your code for this
      nonstandard usage.

- Closed bugs and merge requests:
  * invalid import on signal.h [#295, !382, Philip Chimento]
  * SpiderMonkey 68 [#270, !386, Philip Chimento]
  * GObject: Add override for GObject.handler_block_by_func [#290, !371, Philip
    Chimento]