Problem/Motivation
In #2719721: BreadcrumbBuilder::applies() mismatch with cacheability metadata we added an optional second parameter with the intent to make it mandatory. In the next major version, this requires we update the signature and implementations to always expect a $cacheable_metadata.
Steps to reproduce
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Proposed resolution
Adjust API according to deprecation policy.
Remaining tasks
Adjust API according to deprecation policy.
User interface changes
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API changes
Finalize new function parameter.
Data model changes
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Release notes snippet
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