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Related to facebook/react#13902.
If
fiber.elementType
exists and differs fromfiber.type
, we need to respect thedefaultProps
defined on thefiber.type
. Such default props wouldn't be kept infiber.memoizedProps
. This is why in the React code we also callresolveDefaultProps()
in those cases.I added a regression case to demonstrate it. It should display
<FooWithDefaultProps greeting="Hello" name="World" />
. In master, it is missingname="World"
(that’s the issue I am fixing).