static _propertyValueFromAttribute(value, options) {
        const type = options.type;
        const converter = options.converter || defaultConverter;
        const fromAttribute = (typeof converter === 'function' ? converter : converter.fromAttribute);
        return fromAttribute ? fromAttribute(value, type) : value;
    }
Returns the property value for the given attribute value.
Called via the `attributeChangedCallback` and uses the property's
`converter` or `converter.fromAttribute` property option.
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