[1] [CITE@en[Fix #123 by more closely aligning the conversions unions do when a un…]]
( ([[bzbarsky]]著, [TIME[2016-05-19 23:21:58 +09:00]]))
<https://github.com/heycam/webidl/commit/e03abb2f43df56e1507d074bbc7c6fa92d65211b>

[2] [CITE@en[Add a section on overloads vs. union/optional (#426)]]
([[TimothyGu]]著, [TIME[2017-09-22 16:48:47 +09:00]])
<https://github.com/heycam/webidl/commit/a6a713fc31f487532d0d0ed17613cd983f2c3d23>

[3] [CITE@en[Add an informative section on overloads vs. unions/optional · Issue #307 · heycam/webidl]]
([TIME[2017-09-23 11:43:59 +09:00]])
<https://github.com/heycam/webidl/issues/307>

[4] [CITE@en[Handling overloads · Issue #29 · jsdom/webidl2js]]
([TIME[2017-09-23 11:59:42 +09:00]])
<https://github.com/jsdom/webidl2js/issues/29>

[5] [CITE@en[Add a section on overloads vs. union/optional by TimothyGu · Pull Request #426 · heycam/webidl]]
([TIME[2017-09-23 12:02:10 +09:00]])
<https://github.com/heycam/webidl/pull/426>

[6] [CITE@en[26087 – (object or ArrayBuffer) does not work]]
([TIME[2017-12-08 16:10:47 +09:00]])
<https://www.w3.org/Bugs/Public/show_bug.cgi?id=26087>

[7] [CITE@en[Disallow Promise types in unions at the syntax level.]]
([[Ms2ger]]著, [TIME[2019-06-27 21:11:41 +09:00]])
<https://github.com/heycam/webidl/commit/cc5b4aa81b7d0e5582d81860b83d6f286f7749df>

[8] [CITE@en[Disallow Promise types in unions at the syntax level. by Ms2ger · Pull Request #746 · heycam/webidl]]
([TIME[2020-01-12 15:25:14 +09:00]])
<https://github.com/heycam/webidl/pull/746>

[9] [CITE@en[NonAnyType vs SingleType as home of PromiseType ε alternative · Issue #740 · heycam/webidl]]
([TIME[2020-01-12 15:25:29 +09:00]])
<https://github.com/heycam/webidl/issues/740>