readline: error on falsy values for callback#28109
readline: error on falsy values for callback#28109sam-github wants to merge 1 commit intonodejs:masterfrom
Conversation
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Sadly, an error occurred when I tried to trigger a build. :( |
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The values used to be ignored, so I can definitely see calling it a breaking change. Then again, supplying Consistency is probably the key here. I'll leave decision to folks who are more familiar with what we've been doing with these kinds of changes. |
It was intended, according to in-test comments and common behaviour, that callbacks be either `undefined` or a function, but falsy values were being accepted as meaning "no callback".
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@nodejs/releasers @nodejs/lts I marked semver-major, but no strong feelings. Accumulation of majors mostly affects release line maintenance, any of you have an opinion? |
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Landed in 04633ee |
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@BridgeAR This can/should land in 12.x, it just needs the change to the callback behaviour reverted, and the two new testcases' expectations adjusted to 12.x's current behaviour. |
It was intended, according to in-test comments and common behaviour, that callbacks be either `undefined` or a function, but falsy values were being accepted as meaning "no callback". PR-URL: #28109 Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: Rich Trott <rtrott@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
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@sam-github thanks a lot for the heads up! Would you be so kind and open a backport where you cherry-pick this specific commit and add a compatibility patch on top? |
It was intended, according to in-test comments and common behaviour, that callbacks be either `undefined` or a function, but falsy values were being accepted as meaning "no callback". PR-URL: nodejs#28109 Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: Rich Trott <rtrott@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Notable changes:
- **assert**:
- do not repeat .throws() code (Ruben Bridgewater)
[#28263](#28263)
- wrap validation function errors (Ruben Bridgewater)
[#28263](#28263)
- fix generatedMessage property (Ruben Bridgewater)
[#28263](#28263)
- improve class instance errors (Ruben Bridgewater)
[#28263](#28263)
- **benchmark**:
- use test/common/tmpdir consistently (João Reis)
[#28858](#28858)
- **build**:
- make full-icu the default for releases (Richard Lau)
[#29887](#29887)
- update minimum Xcode version for macOS (Michael Dawson)
[#29622](#29622)
- **child_process**:
- runtime deprecate \_channel (cjihrig)
[#27949](#27949)
- simplify spawn argument parsing (cjihrig)
[#27854](#27854)
- **console**:
- display timeEnd with suitable time unit (Xavier Stouder)
[#29251](#29251)
- **deps**:
- patch V8 to 7.8.279.14 (Myles Borins)
[#29694](#29694)
- patch V8 to 7.8.279.12 (Myles Borins)
[#29694](#29694)
- patch V8 to 7.8.279.10 (Myles Borins)
[#29694](#29694)
- update V8's postmortem script (cjihrig)
[#29694](#29694)
- V8: cherry-pick 716875d (Myles Borins)
[#29694](#29694)
- update V8 to 7.8.279.9 (Myles Borins)
[#29694](#29694)
- V8: cherry-pick b33af60 (Michaël Zasso)
[#28016](#28016)
- update V8 to 7.6.303.28 (Michaël Zasso)
[#28016](#28016)
- **domain**:
- error handler runs outside of its domain (Julien Gilli)
[#26211](#26211)
- **fs**:
- make FSWatcher.start private (Lucas Holmquist)
[#29905](#29905)
- add runtime deprecate for file stream open() (Robert Nagy)
[#29061](#29061)
- allow int64 offset in fs.write/writeSync/fd.write (Zach Bjornson)
[#26572](#26572)
- use IsSafeJsInt instead of IsNumber for ftruncate (Zach Bjornson)
[#26572](#26572)
- allow int64 offset in fs.read/readSync/fd.read (Zach Bjornson)
[#26572](#26572)
- close file descriptor of promisified truncate (João Reis)
[#28858](#28858)
- **http**:
- do not emit end after aborted (Robert Nagy)
[#27984](#27984)
- don't emit 'data' after 'error' (Robert Nagy)
[#28711](#28711)
- remove legacy parser (Anna Henningsen)
[#29589](#29589)
- throw if 'host' agent header is not a string value
(Giorgos Ntemiris)
[#29568](#29568)
- replace superfluous connection property with getter/setter
(Robert Nagy)
[#29015](#29015)
- fix test where aborted should not be emitted (Robert Nagy)
[#20077](#20077)
- remove default 'timeout' listener on upgrade (Luigi Pinca)
[#26030](#26030)
- **http, http2**:
- remove default server timeout (Ali Ijaz Sheikh)
[#27558](#27558)
- **http2**:
- remove security revert flags (Anna Henningsen)
[#29141](#29141)
- remove callback-based padding (Anna Henningsen)
[#29144](#29144)
- **lib**:
- rename validateInteger to validateSafeInteger (Zach Bjornson)
[#26572](#26572)
- correct error.errno to always be numeric (Joyee Cheung)
[#28140](#28140)
- no need to strip BOM or shebang for scripts (Refael Ackermann)
[#27375](#27375)
- rework logic of stripping BOM+Shebang from commonjs (Gus Caplan)
[#27768](#27768)
- **module**:
- runtime deprecate createRequireFromPath() (cjihrig)
[#27951](#27951)
- **readline**:
- error on falsy values for callback (Sam Roberts)
[#28109](#28109)
- **repl**:
- close file descriptor of history file (João Reis)
[#28858](#28858)
- **src**:
- bring 425 status code name into accordance with RFC 8470
(Sergei Osipov)
[#29880](#29880)
- update NODE\_MODULE\_VERSION to 79 (Myles Borins)
[#29694](#29694)
- update NODE\_MODULE\_VERSION to 78 (Michaël Zasso)
[#28918](#28918)
- add error codes to errors thrown in C++ (Yaniv Friedensohn)
[#27700](#27700)
- use non-deprecated overload of V8::SetFlagsFromString
(Michaël Zasso)
[#28016](#28016)
- update NODE\_MODULE\_VERSION to 77 (Michaël Zasso)
[#28016](#28016)
- update NODE\_MODULE\_VERSION to 74 (Refael Ackermann)
[#27375](#27375)
- make process.env.TZ setter clear tz cache (Ben Noordhuis)
[#20026](#20026)
- enable V8's WASM trap handlers (Gus Caplan)
[#27246](#27246)
- **stream**:
- throw unhandled error for readable with autoDestroy (Robert Nagy)
[#29806](#29806)
- always invoke callback before emitting error (Robert Nagy)
[#29293](#29293)
- invoke callback before emitting error always (Robert Nagy)
[#29293](#29293)
- do not flush destroyed writable (Robert Nagy)
[#29028](#29028)
- don't emit finish on error (Robert Nagy)
[#28979](#28979)
- disallow stream methods on finished stream (Robert Nagy)
[#28687](#28687)
- do not emit after 'error' (Robert Nagy)
[#28708](#28708)
- fix destroy() behavior (Robert Nagy)
[#29058](#29058)
- simplify `.pipe()` and `.unpipe()` in Readable (Weijia Wang)
[#28583](#28583)
- **tools**:
- patch V8 to run on older XCode versions (Ujjwal Sharma)
[#29694](#29694)
- update V8 gypfiles (Michaël Zasso)
[#29694](#29694)
- support full-icu by default (Steven R. Loomis)
[#29522](#29522)
- **util**: validate formatWithOptions inspectOptions
(Ruben Bridgewater)
[#29824](#29824)
PR-URL: #29504
Notable changes:
- **assert**:
- do not repeat .throws() code (Ruben Bridgewater)
[#28263](#28263)
- wrap validation function errors (Ruben Bridgewater)
[#28263](#28263)
- fix generatedMessage property (Ruben Bridgewater)
[#28263](#28263)
- improve class instance errors (Ruben Bridgewater)
[#28263](#28263)
- **benchmark**:
- use test/common/tmpdir consistently (João Reis)
[#28858](#28858)
- **build**:
- make full-icu the default for releases (Richard Lau)
[#29887](#29887)
- update minimum Xcode version for macOS (Michael Dawson)
[#29622](#29622)
- **child_process**:
- runtime deprecate \_channel (cjihrig)
[#27949](#27949)
- simplify spawn argument parsing (cjihrig)
[#27854](#27854)
- **console**:
- display timeEnd with suitable time unit (Xavier Stouder)
[#29251](#29251)
- **deps**:
- patch V8 to 7.8.279.14 (Myles Borins)
[#29694](#29694)
- patch V8 to 7.8.279.12 (Myles Borins)
[#29694](#29694)
- patch V8 to 7.8.279.10 (Myles Borins)
[#29694](#29694)
- update V8's postmortem script (cjihrig)
[#29694](#29694)
- V8: cherry-pick 716875d (Myles Borins)
[#29694](#29694)
- update V8 to 7.8.279.9 (Myles Borins)
[#29694](#29694)
- V8: cherry-pick b33af60 (Michaël Zasso)
[#28016](#28016)
- update V8 to 7.6.303.28 (Michaël Zasso)
[#28016](#28016)
- **domain**:
- error handler runs outside of its domain (Julien Gilli)
[#26211](#26211)
- **fs**:
- make FSWatcher.start private (Lucas Holmquist)
[#29905](#29905)
- add runtime deprecate for file stream open() (Robert Nagy)
[#29061](#29061)
- allow int64 offset in fs.write/writeSync/fd.write (Zach Bjornson)
[#26572](#26572)
- use IsSafeJsInt instead of IsNumber for ftruncate (Zach Bjornson)
[#26572](#26572)
- allow int64 offset in fs.read/readSync/fd.read (Zach Bjornson)
[#26572](#26572)
- close file descriptor of promisified truncate (João Reis)
[#28858](#28858)
- **http**:
- do not emit end after aborted (Robert Nagy)
[#27984](#27984)
- don't emit 'data' after 'error' (Robert Nagy)
[#28711](#28711)
- remove legacy parser (Anna Henningsen)
[#29589](#29589)
- throw if 'host' agent header is not a string value
(Giorgos Ntemiris)
[#29568](#29568)
- replace superfluous connection property with getter/setter
(Robert Nagy)
[#29015](#29015)
- fix test where aborted should not be emitted (Robert Nagy)
[#20077](#20077)
- remove default 'timeout' listener on upgrade (Luigi Pinca)
[#26030](#26030)
- **http, http2**:
- remove default server timeout (Ali Ijaz Sheikh)
[#27558](#27558)
- **http2**:
- remove security revert flags (Anna Henningsen)
[#29141](#29141)
- remove callback-based padding (Anna Henningsen)
[#29144](#29144)
- **lib**:
- rename validateInteger to validateSafeInteger (Zach Bjornson)
[#26572](#26572)
- correct error.errno to always be numeric (Joyee Cheung)
[#28140](#28140)
- no need to strip BOM or shebang for scripts (Refael Ackermann)
[#27375](#27375)
- rework logic of stripping BOM+Shebang from commonjs (Gus Caplan)
[#27768](#27768)
- **module**:
- runtime deprecate createRequireFromPath() (cjihrig)
[#27951](#27951)
- **readline**:
- error on falsy values for callback (Sam Roberts)
[#28109](#28109)
- **repl**:
- close file descriptor of history file (João Reis)
[#28858](#28858)
- **src**:
- bring 425 status code name into accordance with RFC 8470
(Sergei Osipov)
[#29880](#29880)
- update NODE\_MODULE\_VERSION to 79 (Myles Borins)
[#29694](#29694)
- update NODE\_MODULE\_VERSION to 78 (Michaël Zasso)
[#28918](#28918)
- add error codes to errors thrown in C++ (Yaniv Friedensohn)
[#27700](#27700)
- use non-deprecated overload of V8::SetFlagsFromString
(Michaël Zasso)
[#28016](#28016)
- update NODE\_MODULE\_VERSION to 77 (Michaël Zasso)
[#28016](#28016)
- update NODE\_MODULE\_VERSION to 74 (Refael Ackermann)
[#27375](#27375)
- make process.env.TZ setter clear tz cache (Ben Noordhuis)
[#20026](#20026)
- enable V8's WASM trap handlers (Gus Caplan)
[#27246](#27246)
- **stream**:
- throw unhandled error for readable with autoDestroy (Robert Nagy)
[#29806](#29806)
- always invoke callback before emitting error (Robert Nagy)
[#29293](#29293)
- invoke callback before emitting error always (Robert Nagy)
[#29293](#29293)
- do not flush destroyed writable (Robert Nagy)
[#29028](#29028)
- don't emit finish on error (Robert Nagy)
[#28979](#28979)
- disallow stream methods on finished stream (Robert Nagy)
[#28687](#28687)
- do not emit after 'error' (Robert Nagy)
[#28708](#28708)
- fix destroy() behavior (Robert Nagy)
[#29058](#29058)
- simplify `.pipe()` and `.unpipe()` in Readable (Weijia Wang)
[#28583](#28583)
- **tools**:
- patch V8 to run on older XCode versions (Ujjwal Sharma)
[#29694](#29694)
- update V8 gypfiles (Michaël Zasso)
[#29694](#29694)
- support full-icu by default (Steven R. Loomis)
[#29522](#29522)
- **util**: validate formatWithOptions inspectOptions
(Ruben Bridgewater)
[#29824](#29824)
PR-URL: #29504
Notable changes:
- **assert**:
- do not repeat .throws() code (Ruben Bridgewater)
[#28263](#28263)
- wrap validation function errors (Ruben Bridgewater)
[#28263](#28263)
- fix generatedMessage property (Ruben Bridgewater)
[#28263](#28263)
- improve class instance errors (Ruben Bridgewater)
[#28263](#28263)
- **benchmark**:
- use test/common/tmpdir consistently (João Reis)
[#28858](#28858)
- **build**:
- make full-icu the default for releases (Richard Lau)
[#29887](#29887)
- update minimum Xcode version for macOS (Michael Dawson)
[#29622](#29622)
- **child_process**:
- runtime deprecate \_channel (cjihrig)
[#27949](#27949)
- simplify spawn argument parsing (cjihrig)
[#27854](#27854)
- **console**:
- display timeEnd with suitable time unit (Xavier Stouder)
[#29251](#29251)
- **deps**:
- patch V8 to 7.8.279.14 (Myles Borins)
[#29694](#29694)
- patch V8 to 7.8.279.12 (Myles Borins)
[#29694](#29694)
- patch V8 to 7.8.279.10 (Myles Borins)
[#29694](#29694)
- update V8's postmortem script (cjihrig)
[#29694](#29694)
- V8: cherry-pick 716875d (Myles Borins)
[#29694](#29694)
- update V8 to 7.8.279.9 (Myles Borins)
[#29694](#29694)
- V8: cherry-pick b33af60 (Michaël Zasso)
[#28016](#28016)
- update V8 to 7.6.303.28 (Michaël Zasso)
[#28016](#28016)
- **domain**:
- error handler runs outside of its domain (Julien Gilli)
[#26211](#26211)
- **fs**:
- make FSWatcher.start private (Lucas Holmquist)
[#29905](#29905)
- add runtime deprecate for file stream open() (Robert Nagy)
[#29061](#29061)
- allow int64 offset in fs.write/writeSync/fd.write (Zach Bjornson)
[#26572](#26572)
- use IsSafeJsInt instead of IsNumber for ftruncate (Zach Bjornson)
[#26572](#26572)
- allow int64 offset in fs.read/readSync/fd.read (Zach Bjornson)
[#26572](#26572)
- close file descriptor of promisified truncate (João Reis)
[#28858](#28858)
- **http**:
- do not emit end after aborted (Robert Nagy)
[#27984](#27984)
- don't emit 'data' after 'error' (Robert Nagy)
[#28711](#28711)
- remove legacy parser (Anna Henningsen)
[#29589](#29589)
- throw if 'host' agent header is not a string value
(Giorgos Ntemiris)
[#29568](#29568)
- replace superfluous connection property with getter/setter
(Robert Nagy)
[#29015](#29015)
- fix test where aborted should not be emitted (Robert Nagy)
[#20077](#20077)
- remove default 'timeout' listener on upgrade (Luigi Pinca)
[#26030](#26030)
- **http, http2**:
- remove default server timeout (Ali Ijaz Sheikh)
[#27558](#27558)
- **http2**:
- remove security revert flags (Anna Henningsen)
[#29141](#29141)
- remove callback-based padding (Anna Henningsen)
[#29144](#29144)
- **lib**:
- rename validateInteger to validateSafeInteger (Zach Bjornson)
[#26572](#26572)
- correct error.errno to always be numeric (Joyee Cheung)
[#28140](#28140)
- no need to strip BOM or shebang for scripts (Refael Ackermann)
[#27375](#27375)
- rework logic of stripping BOM+Shebang from commonjs (Gus Caplan)
[#27768](#27768)
- **module**:
- runtime deprecate createRequireFromPath() (cjihrig)
[#27951](#27951)
- **readline**:
- error on falsy values for callback (Sam Roberts)
[#28109](#28109)
- **repl**:
- close file descriptor of history file (João Reis)
[#28858](#28858)
- **src**:
- bring 425 status code name into accordance with RFC 8470
(Sergei Osipov)
[#29880](#29880)
- update NODE\_MODULE\_VERSION to 79 (Myles Borins)
[#29694](#29694)
- update NODE\_MODULE\_VERSION to 78 (Michaël Zasso)
[#28918](#28918)
- add error codes to errors thrown in C++ (Yaniv Friedensohn)
[#27700](#27700)
- use non-deprecated overload of V8::SetFlagsFromString
(Michaël Zasso)
[#28016](#28016)
- update NODE\_MODULE\_VERSION to 77 (Michaël Zasso)
[#28016](#28016)
- update NODE\_MODULE\_VERSION to 74 (Refael Ackermann)
[#27375](#27375)
- make process.env.TZ setter clear tz cache (Ben Noordhuis)
[#20026](#20026)
- enable V8's WASM trap handlers (Gus Caplan)
[#27246](#27246)
- **stream**:
- throw unhandled error for readable with autoDestroy (Robert Nagy)
[#29806](#29806)
- always invoke callback before emitting error (Robert Nagy)
[#29293](#29293)
- invoke callback before emitting error always (Robert Nagy)
[#29293](#29293)
- do not flush destroyed writable (Robert Nagy)
[#29028](#29028)
- don't emit finish on error (Robert Nagy)
[#28979](#28979)
- disallow stream methods on finished stream (Robert Nagy)
[#28687](#28687)
- do not emit after 'error' (Robert Nagy)
[#28708](#28708)
- fix destroy() behavior (Robert Nagy)
[#29058](#29058)
- simplify `.pipe()` and `.unpipe()` in Readable (Weijia Wang)
[#28583](#28583)
- **tools**:
- patch V8 to run on older XCode versions (Ujjwal Sharma)
[#29694](#29694)
- update V8 gypfiles (Michaël Zasso)
[#29694](#29694)
- support full-icu by default (Steven R. Loomis)
[#29522](#29522)
- **util**: validate formatWithOptions inspectOptions
(Ruben Bridgewater)
[#29824](#29824)
PR-URL: #29504
Notable changes:
- **assert**:
- do not repeat .throws() code (Ruben Bridgewater)
[#28263](#28263)
- wrap validation function errors (Ruben Bridgewater)
[#28263](#28263)
- fix generatedMessage property (Ruben Bridgewater)
[#28263](#28263)
- improve class instance errors (Ruben Bridgewater)
[#28263](#28263)
- **benchmark**:
- use test/common/tmpdir consistently (João Reis)
[#28858](#28858)
- **build**:
- make full-icu the default for releases (Richard Lau)
[#29887](#29887)
- update minimum Xcode version for macOS (Michael Dawson)
[#29622](#29622)
- **child_process**:
- runtime deprecate \_channel (cjihrig)
[#27949](#27949)
- simplify spawn argument parsing (cjihrig)
[#27854](#27854)
- **console**:
- display timeEnd with suitable time unit (Xavier Stouder)
[#29251](#29251)
- **deps**:
- patch V8 to 7.8.279.14 (Myles Borins)
[#29694](#29694)
- patch V8 to 7.8.279.12 (Myles Borins)
[#29694](#29694)
- patch V8 to 7.8.279.10 (Myles Borins)
[#29694](#29694)
- update V8's postmortem script (cjihrig)
[#29694](#29694)
- V8: cherry-pick 716875d (Myles Borins)
[#29694](#29694)
- update V8 to 7.8.279.9 (Myles Borins)
[#29694](#29694)
- V8: cherry-pick b33af60 (Michaël Zasso)
[#28016](#28016)
- update V8 to 7.6.303.28 (Michaël Zasso)
[#28016](#28016)
- **domain**:
- error handler runs outside of its domain (Julien Gilli)
[#26211](#26211)
- **fs**:
- make FSWatcher.start private (Lucas Holmquist)
[#29905](#29905)
- add runtime deprecate for file stream open() (Robert Nagy)
[#29061](#29061)
- allow int64 offset in fs.write/writeSync/fd.write (Zach Bjornson)
[#26572](#26572)
- use IsSafeJsInt instead of IsNumber for ftruncate (Zach Bjornson)
[#26572](#26572)
- allow int64 offset in fs.read/readSync/fd.read (Zach Bjornson)
[#26572](#26572)
- close file descriptor of promisified truncate (João Reis)
[#28858](#28858)
- **http**:
- do not emit end after aborted (Robert Nagy)
[#27984](#27984)
- don't emit 'data' after 'error' (Robert Nagy)
[#28711](#28711)
- remove legacy parser (Anna Henningsen)
[#29589](#29589)
- throw if 'host' agent header is not a string value
(Giorgos Ntemiris)
[#29568](#29568)
- replace superfluous connection property with getter/setter
(Robert Nagy)
[#29015](#29015)
- fix test where aborted should not be emitted (Robert Nagy)
[#20077](#20077)
- remove default 'timeout' listener on upgrade (Luigi Pinca)
[#26030](#26030)
- **http, http2**:
- remove default server timeout (Ali Ijaz Sheikh)
[#27558](#27558)
- **http2**:
- remove security revert flags (Anna Henningsen)
[#29141](#29141)
- remove callback-based padding (Anna Henningsen)
[#29144](#29144)
- **lib**:
- rename validateInteger to validateSafeInteger (Zach Bjornson)
[#26572](#26572)
- correct error.errno to always be numeric (Joyee Cheung)
[#28140](#28140)
- no need to strip BOM or shebang for scripts (Refael Ackermann)
[#27375](#27375)
- rework logic of stripping BOM+Shebang from commonjs (Gus Caplan)
[#27768](#27768)
- **module**:
- runtime deprecate createRequireFromPath() (cjihrig)
[#27951](#27951)
- **readline**:
- error on falsy values for callback (Sam Roberts)
[#28109](#28109)
- **repl**:
- close file descriptor of history file (João Reis)
[#28858](#28858)
- **src**:
- bring 425 status code name into accordance with RFC 8470
(Sergei Osipov)
[#29880](#29880)
- update NODE\_MODULE\_VERSION to 79 (Myles Borins)
[#29694](#29694)
- update NODE\_MODULE\_VERSION to 78 (Michaël Zasso)
[#28918](#28918)
- add error codes to errors thrown in C++ (Yaniv Friedensohn)
[#27700](#27700)
- use non-deprecated overload of V8::SetFlagsFromString
(Michaël Zasso)
[#28016](#28016)
- update NODE\_MODULE\_VERSION to 77 (Michaël Zasso)
[#28016](#28016)
- update NODE\_MODULE\_VERSION to 74 (Refael Ackermann)
[#27375](#27375)
- make process.env.TZ setter clear tz cache (Ben Noordhuis)
[#20026](#20026)
- enable V8's WASM trap handlers (Gus Caplan)
[#27246](#27246)
- **stream**:
- throw unhandled error for readable with autoDestroy (Robert Nagy)
[#29806](#29806)
- always invoke callback before emitting error (Robert Nagy)
[#29293](#29293)
- invoke callback before emitting error always (Robert Nagy)
[#29293](#29293)
- do not flush destroyed writable (Robert Nagy)
[#29028](#29028)
- don't emit finish on error (Robert Nagy)
[#28979](#28979)
- disallow stream methods on finished stream (Robert Nagy)
[#28687](#28687)
- do not emit after 'error' (Robert Nagy)
[#28708](#28708)
- fix destroy() behavior (Robert Nagy)
[#29058](#29058)
- simplify `.pipe()` and `.unpipe()` in Readable (Weijia Wang)
[#28583](#28583)
- **tools**:
- patch V8 to run on older XCode versions (Ujjwal Sharma)
[#29694](#29694)
- update V8 gypfiles (Michaël Zasso)
[#29694](#29694)
- support full-icu by default (Steven R. Loomis)
[#29522](#29522)
- **util**: validate formatWithOptions inspectOptions
(Ruben Bridgewater)
[#29824](#29824)
PR-URL: #29504
It was intended, according to in-test comments and common behaviour,
that callbacks be either
undefinedor a function, but falsy valueswere being accepted as meaning "no callback".
Checklist
make -j4 test(UNIX), orvcbuild test(Windows) passes