VDOM property removal leaves native DOM state unchanged

[yorkin-bot]

Summary

When a property exists on the old VNode but is omitted from the new VNode, the diff calls remove_property. The JavaScript implementation is delete self[prop], which does not reset native DOM properties implemented as prototype accessors.

For example, after rendering an element with disabled = true, rerendering it without that property can leave element.disabled === true.

This is different from #49: that issue covers an explicit true -> false update, while this issue covers Some(value) -> None / property omission.

Evidence

The removal path is here:

• VDOM diff removes old-only properties
• remove_property uses delete self[prop]

Several element helpers still put native values in the property map, including disabled, checked, value, multiple, hidden, required, controls, autoplay, loop, and muted.

There is already a comment acknowledging this behavior for the attribute-level disabled helper:

• Attrs::disabled workaround/comment

Minimal reproduction

A white-box runtime test using an element whose disabled property is an accessor on its prototype performs these two renders:

1. Render with disabled: true.
2. Render the same node with the property omitted.

Observed result:

audit: removing a VDOM property resets the native property failed
assert_false(disabled): `true` is not false

Deleting the property does not invoke the native setter or restore its default.

Expected behavior

Removing a VDOM property should restore the corresponding DOM state, so a property does not remain stale after it disappears from the next VNode.

A generic delete is insufficient because reset values differ by property. Possible approaches include property-specific defaults, representing boolean state as attributes where appropriate, or retaining/restoring the element's initial/default value.

Suggested tests

Please cover at least:

• disabled: true -> omitted
• checked: true -> omitted
• a string property such as value: "x" -> omitted
• explicit true -> false behavior from Vdom diff fail to detect disabled property change #49 remains intact