[2.x] Upgrade after binding results in default value for properties with no effects #4540
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kevinpschaaf
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Apr 18, 2017
sorvell
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Apr 18, 2017
Guard against overwriting bound values with hasOwnProperty. Fixes #4540
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Description
When an element is lazily upgraded after its host binds values to it, the bound value will incorrectly revert to its default value if the property has no property effects. This behavior is correct for properties that do have property effects.
Live Demo
https://jsbin.com/hepidek/edit?html,console,output
Expected Results
Actual Results
Browsers Affected
All
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