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LibJS: Make Value() default-construct the undefined value

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The special empty value (that we use for array holes, Optional<Value>
when empty and a few other other placeholder/sentinel tasks) still
exists, but you now create one via JS::js_special_empty_value() and
check for it with Value::is_special_empty_value().

The main idea here is to make it very unlikely to accidentally create an
unexpected special empty value.
This commit is contained in:
Andreas Kling
2025-04-04 23:16:34 +02:00
committed by Andreas Kling
parent 0d91363742
commit 3cf50539ec
Notes: github-actions[bot] 2025-04-05 09:21:31 +00:00 
Author: https://github.com/awesomekling
Commit: https://github.com/LadybirdBrowser/ladybird/commit/3cf50539ec0
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/4232
43 changed files with 165 additions and 122 deletions
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2
Utilities/js.cpp
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@@ -778,7 +778,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
if (value_or_error.is_error())
return {};
auto variable = value_or_error.value();
VERIFY(!variable.is_empty());
VERIFY(!variable.is_special_empty_value());
if (!variable.is_object())
break;