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fix(runtime): preserve empty union attributes in custom elements (#6963) - #6968
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Elements2720 wants to merge 1 commit into
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Summary
attributeChangedCallback now treats only strict equality and nullish pairs as unchanged, so an empty string remains distinct from false for boolean|string props. Added a dist-custom-elements browser regression test.
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Merge Danger
Door: two-way
Blast Radius: runtime
Fixes #6963