[scoped-custom-element-registry] Non-string Values Are Not Properly Stringified Before Calling attributeChangedCallback in setAttribute

[oscarmarina]

Description

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.

Example

Playground

Steps to reproduce

Expected behavior

Similar to toggleAttribute, a preliminary step const newValue = this.getAttribute(name) is added for use in attributeChangedCallback.

Actual behavior

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