Define `util.inspect.custom` as
`Symbol.for("nodejs.util.inspect.custom")` rather than
`Symbol("util.inspect.custom")`. This allows `inspect` hooks to
easily/safely be defined in non-Node.js environments.

Fixes: nodejs#20821
Refs: nodejs#22684

PR-URL: nodejs#20857
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: John-David Dalton <john.david.dalton@gmail.com>

Define `util.inspect.custom` as
`Symbol.for("nodejs.util.inspect.custom")` rather than
`Symbol("util.inspect.custom")`. This allows `inspect` hooks to
easily/safely be defined in non-Node.js environments.

Fixes: #20821
Refs: #22684

Backport-PR-URL: #23039
PR-URL: #20857
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: John-David Dalton <john.david.dalton@gmail.com>

Notable changes:

* assert
  * The diff output is now a tiny bit improved by sorting object
    properties when inspecting the values that are compared with each
    other. #22788
* cli
  * The options parser now normalizes `_` to `-` in all multi-word
    command-line flags, e.g. `--no_warnings` has the same effect as
    `--no-warnings`. #23020
  * Added bash completion for the `node` binary. To generate a bash
    completion script, run `node --completion-bash`. The output can be
    saved to a file which can be sourced to enable completion.
    #20713
* crypto
  * Added support for PEM-level encryption.
    #23151
  * Added an API asymmetric key pair generation. The new methods
    `crypto.generateKeyPair` and `crypto.generateKeyPairSync` can be
    used to generate public and private key pairs. The API supports
    RSA, DSA and EC and a variety of key encodings (both PEM and DER).
    #22660
* fs
  * Added a `recursive` option to `fs.mkdir` and `fs.mkdirSync`. If
    this option is set to true, non-existing parent folders will be
    automatically created. #21875
* http2
  * Added a `'ping'` event to `Http2Session` that is emitted whenever a
    non-ack `PING` is received.
    #23009
  * Added support for the `ORIGIN` frame.
    #22956
* module
  * Added `module.createRequireFromPath(filename)`. This new method can
    be used to create a custom require function that will resolve
    modules relative to the filename path.
    #19360
* process
  * Added a `'multipleResolves'` process event that is emitted whenever
    a `Promise` is attempted to be resolved multiple times, e.g. if the
    `resolve` and `reject` functions are both called in a `Promise`
    executor. #22218
* **url**
  * Added `url.fileURLToPath(url)` and `url.pathToFileURL(path)`. These
    methods can be used to correctly convert between file: URLs and
    absolute paths. #22506
* **util**
  * Added the `sorted` option to `util.inspect()`. If set to `true`,
    all properties of an object and Set and Map entries will be sorted
    in the returned string. If set to a function, it is used as a
    compare function. #22788
  * The `util.instpect.custom` symbol is now defined in the global
    symbol registry as `Symbol.for('nodejs.util.inspect.custom')`.
    #20857
* **Windows**
  * The Windows msi installer now provides an option to automatically
    install the tools required to build native modules.
    #22645
* **Added new collaborators**:
  * digitalinfinity - Hitesh Kanwathirtha

PR-URL: #23313

Notable changes:

* assert
  * The diff output is now a tiny bit improved by sorting object
    properties when inspecting the values that are compared with each
    other. #22788
* cli
  * The options parser now normalizes `_` to `-` in all multi-word
    command-line flags, e.g. `--no_warnings` has the same effect as
    `--no-warnings`. #23020
  * Added bash completion for the `node` binary. To generate a bash
    completion script, run `node --completion-bash`. The output can be
    saved to a file which can be sourced to enable completion.
    #20713
* crypto
  * Added support for PEM-level encryption.
    #23151
  * Added an API asymmetric key pair generation. The new methods
    `crypto.generateKeyPair` and `crypto.generateKeyPairSync` can be
    used to generate public and private key pairs. The API supports
    RSA, DSA and EC and a variety of key encodings (both PEM and DER).
    #22660
* fs
  * Added a `recursive` option to `fs.mkdir` and `fs.mkdirSync`. If
    this option is set to true, non-existing parent folders will be
    automatically created. #21875
* http2
  * Added a `'ping'` event to `Http2Session` that is emitted whenever a
    non-ack `PING` is received.
    #23009
  * Added support for the `ORIGIN` frame.
    #22956
  * Updated nghttp2 to 1.34.0. This adds RFC 8441 extended connect
    protocol support to allow use of WebSockets over HTTP/2.
    #23284
* module
  * Added `module.createRequireFromPath(filename)`. This new method can
    be used to create a custom require function that will resolve
    modules relative to the filename path.
    #19360
* process
  * Added a `'multipleResolves'` process event that is emitted whenever
    a `Promise` is attempted to be resolved multiple times, e.g. if the
    `resolve` and `reject` functions are both called in a `Promise`
    executor. #22218
* url
  * Added `url.fileURLToPath(url)` and `url.pathToFileURL(path)`. These
    methods can be used to correctly convert between file: URLs and
    absolute paths. #22506
* util
  * Added the `sorted` option to `util.inspect()`. If set to `true`,
    all properties of an object and Set and Map entries will be sorted
    in the returned string. If set to a function, it is used as a
    compare function. #22788
  * The `util.instpect.custom` symbol is now defined in the global
    symbol registry as `Symbol.for('nodejs.util.inspect.custom')`.
    #20857
  * Added support for `BigInt` numbers in `util.format()`.
    #22097
* V8 API
  * A number of V8 C++ APIs have been marked as deprecated since they
    have been removed in the upstream repository. Replacement APIs
    are added where necessary. #23159
* Windows
  * The Windows msi installer now provides an option to automatically
    install the tools required to build native modules.
    #22645
* Workers
  * Debugging support for Workers using the DevTools protocol has been
    implemented. #21364
  * The public `inspector` module is now enabled in Workers.
    #22769
* Added new collaborators:
  * digitalinfinity - Hitesh Kanwathirtha

PR-URL: #23313

Notable changes:

* assert
  * The diff output is now a tiny bit improved by sorting object
    properties when inspecting the values that are compared with each
    other. #22788
* cli
  * The options parser now normalizes `_` to `-` in all multi-word
    command-line flags, e.g. `--no_warnings` has the same effect as
    `--no-warnings`. #23020
  * Added bash completion for the `node` binary. To generate a bash
    completion script, run `node --completion-bash`. The output can be
    saved to a file which can be sourced to enable completion.
    #20713
* crypto
  * Added support for PEM-level encryption.
    #23151
  * Added an API asymmetric key pair generation. The new methods
    `crypto.generateKeyPair` and `crypto.generateKeyPairSync` can be
    used to generate public and private key pairs. The API supports
    RSA, DSA and EC and a variety of key encodings (both PEM and DER).
    #22660
* fs
  * Added a `recursive` option to `fs.mkdir` and `fs.mkdirSync`. If
    this option is set to true, non-existing parent folders will be
    automatically created. #21875
* http2
  * Added a `'ping'` event to `Http2Session` that is emitted whenever a
    non-ack `PING` is received.
    #23009
  * Added support for the `ORIGIN` frame.
    #22956
  * Updated nghttp2 to 1.34.0. This adds RFC 8441 extended connect
    protocol support to allow use of WebSockets over HTTP/2.
    #23284
* module
  * Added `module.createRequireFromPath(filename)`. This new method can
    be used to create a custom require function that will resolve
    modules relative to the filename path.
    #19360
* process
  * Added a `'multipleResolves'` process event that is emitted whenever
    a `Promise` is attempted to be resolved multiple times, e.g. if the
    `resolve` and `reject` functions are both called in a `Promise`
    executor. #22218
* url
  * Added `url.fileURLToPath(url)` and `url.pathToFileURL(path)`. These
    methods can be used to correctly convert between file: URLs and
    absolute paths. #22506
* util
  * Added the `sorted` option to `util.inspect()`. If set to `true`,
    all properties of an object and Set and Map entries will be sorted
    in the returned string. If set to a function, it is used as a
    compare function. #22788
  * The `util.instpect.custom` symbol is now defined in the global
    symbol registry as `Symbol.for('nodejs.util.inspect.custom')`.
    #20857
  * Added support for `BigInt` numbers in `util.format()`.
    #22097
* V8 API
  * A number of V8 C++ APIs have been marked as deprecated since they
    have been removed in the upstream repository. Replacement APIs
    are added where necessary. #23159
* Windows
  * The Windows msi installer now provides an option to automatically
    install the tools required to build native modules.
    #22645
* Workers
  * Debugging support for Workers using the DevTools protocol has been
    implemented. #21364
  * The public `inspector` module is now enabled in Workers.
    #22769
* Added new collaborators:
  * digitalinfinity - Hitesh Kanwathirtha

PR-URL: #23313

Notable changes:

* assert
  * The diff output is now a tiny bit improved by sorting object
    properties when inspecting the values that are compared with each
    other. #22788
* cli
  * The options parser now normalizes `_` to `-` in all multi-word
    command-line flags, e.g. `--no_warnings` has the same effect as
    `--no-warnings`. #23020
  * Added bash completion for the `node` binary. To generate a bash
    completion script, run `node --completion-bash`. The output can be
    saved to a file which can be sourced to enable completion.
    #20713
* crypto
  * Added support for PEM-level encryption.
    #23151
  * Added an API asymmetric key pair generation. The new methods
    `crypto.generateKeyPair` and `crypto.generateKeyPairSync` can be
    used to generate public and private key pairs. The API supports
    RSA, DSA and EC and a variety of key encodings (both PEM and DER).
    #22660
* fs
  * Added a `recursive` option to `fs.mkdir` and `fs.mkdirSync`. If
    this option is set to true, non-existing parent folders will be
    automatically created. #21875
* http2
  * Added a `'ping'` event to `Http2Session` that is emitted whenever a
    non-ack `PING` is received.
    #23009
  * Added support for the `ORIGIN` frame.
    #22956
  * Updated nghttp2 to 1.34.0. This adds RFC 8441 extended connect
    protocol support to allow use of WebSockets over HTTP/2.
    #23284
* module
  * Added `module.createRequireFromPath(filename)`. This new method can
    be used to create a custom require function that will resolve
    modules relative to the filename path.
    #19360
* process
  * Added a `'multipleResolves'` process event that is emitted whenever
    a `Promise` is attempted to be resolved multiple times, e.g. if the
    `resolve` and `reject` functions are both called in a `Promise`
    executor. #22218
* url
  * Added `url.fileURLToPath(url)` and `url.pathToFileURL(path)`. These
    methods can be used to correctly convert between file: URLs and
    absolute paths. #22506
* util
  * Added the `sorted` option to `util.inspect()`. If set to `true`,
    all properties of an object and Set and Map entries will be sorted
    in the returned string. If set to a function, it is used as a
    compare function. #22788
  * The `util.instpect.custom` symbol is now defined in the global
    symbol registry as `Symbol.for('nodejs.util.inspect.custom')`.
    #20857
  * Added support for `BigInt` numbers in `util.format()`.
    #22097
* V8 API
  * A number of V8 C++ APIs have been marked as deprecated since they
    have been removed in the upstream repository. Replacement APIs
    are added where necessary. #23159
* Windows
  * The Windows msi installer now provides an option to automatically
    install the tools required to build native modules.
    #22645
* Workers
  * Debugging support for Workers using the DevTools protocol has been
    implemented. #21364
  * The public `inspector` module is now enabled in Workers.
    #22769
* Added new collaborators:
  * digitalinfinity - Hitesh Kanwathirtha

PR-URL: #23313

Notable changes:

* assert
  * The diff output is now a tiny bit improved by sorting object
    properties when inspecting the values that are compared with each
    other. #22788
* cli
  * The options parser now normalizes `_` to `-` in all multi-word
    command-line flags, e.g. `--no_warnings` has the same effect as
    `--no-warnings`. #23020
  * Added bash completion for the `node` binary. To generate a bash
    completion script, run `node --completion-bash`. The output can be
    saved to a file which can be sourced to enable completion.
    #20713
* crypto
  * Added support for PEM-level encryption.
    #23151
  * Added an API asymmetric key pair generation. The new methods
    `crypto.generateKeyPair` and `crypto.generateKeyPairSync` can be
    used to generate public and private key pairs. The API supports
    RSA, DSA and EC and a variety of key encodings (both PEM and DER).
    #22660
* fs
  * Added a `recursive` option to `fs.mkdir` and `fs.mkdirSync`. If
    this option is set to true, non-existing parent folders will be
    automatically created. #21875
* http2
  * Added a `'ping'` event to `Http2Session` that is emitted whenever a
    non-ack `PING` is received.
    #23009
  * Added support for the `ORIGIN` frame.
    #22956
  * Updated nghttp2 to 1.34.0. This adds RFC 8441 extended connect
    protocol support to allow use of WebSockets over HTTP/2.
    #23284
* module
  * Added `module.createRequireFromPath(filename)`. This new method can
    be used to create a custom require function that will resolve
    modules relative to the filename path.
    #19360
* process
  * Added a `'multipleResolves'` process event that is emitted whenever
    a `Promise` is attempted to be resolved multiple times, e.g. if the
    `resolve` and `reject` functions are both called in a `Promise`
    executor. #22218
* url
  * Added `url.fileURLToPath(url)` and `url.pathToFileURL(path)`. These
    methods can be used to correctly convert between file: URLs and
    absolute paths. #22506
* util
  * Added the `sorted` option to `util.inspect()`. If set to `true`,
    all properties of an object and Set and Map entries will be sorted
    in the returned string. If set to a function, it is used as a
    compare function. #22788
  * The `util.instpect.custom` symbol is now defined in the global
    symbol registry as `Symbol.for('nodejs.util.inspect.custom')`.
    #20857
  * Added support for `BigInt` numbers in `util.format()`.
    #22097
* V8 API
  * A number of V8 C++ APIs have been marked as deprecated since they
    have been removed in the upstream repository. Replacement APIs
    are added where necessary. #23159
* Windows
  * The Windows msi installer now provides an option to automatically
    install the tools required to build native modules.
    #22645
* Workers
  * Debugging support for Workers using the DevTools protocol has been
    implemented. #21364
  * The public `inspector` module is now enabled in Workers.
    #22769
* Added new collaborators:
  * digitalinfinity - Hitesh Kanwathirtha

PR-URL: #23313

Ports the `buffer-inspect` test from Node core.
Adds a `Buffer.prototype[util.inspect.custom]` method, which is an alias
to `Buffer.prototype.inspect`. Node already doesn't have an `.inspect`
method on Buffers anymore, but since this module has to work in browsers
that do not have Symbols, it seems better to keep it around.

In Node, this will use the builtin `util.inspect.custom` symbol. In the
browser, it will use `Symbol.for('util.inspect.custom')`. The browser
version of `util` will also use the `inspect-custom-symbol` module in
the near future.

If nodejs/node#20857 gets merged,
`Symbol.for('util.inspect.custom')` will be used everywhere and the
dependency on `inspect-custom-symbol` could probably be dropped.

The motivation for this is API parity and the fact that Node is
removing support for the old `.inspect` method:
nodejs/node#20722