[scoped-custom-element-registry] Non-string Values Are Not Properly Stringified Before Calling attributeChangedCallback in setAttribute#616
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…ute() Any value set via `setAttribute` gets converted to a plain string, because that's how HTML attributes work. However, this polyfil was missing this step, and it was passing the raw non-string value to the custom element attributeChangedCallback. This behavior is wrong, and it is a regression when compared to not using the polyfill. Fixes webcomponents#607, supersedes webcomponents#616
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The patched class setAttribute calls attributeChangedCallback without converting value to a string. This can lead to unexpected behavior when passing numeric or otherwise non-string values.
Fixes #607