Add info about array .length observers (Edit #2420)

Polymer / old-docs-site

Old Polymer site. Replaced by these repos: polymer-project.org, polymer-library-docs

https://www.polymer-project.org

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Closed ghost closed 5 years ago

ghost commented 6 years ago

Edits for #2420 by Flamenco

ghost commented 6 years ago

Will merge in a couple days unless there are issues :)