Loosen _attachDom return signature.

Polymer / polymer

Our original Web Component library.

https://polymer-library.polymer-project.org/

BSD 3-Clause "New" or "Revised" License

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Closed tomoueda closed 3 years ago

tomoueda commented 4 years ago

rictic commented 4 years ago

Fixes #5665

rictic commented 4 years ago

Please also update the changelog