Describe the problem

• how JS expressions are converted to a string in markup (about the fact that it is simply converted to a string, you can use toString, undefined and null become an empty string, what about the attributes)
• when a prop is set to the default value (if the value is undefined or not specified, about $bindable, does the expression run every time)

Describe the proposed solution

I would like to see these important details written about in the documentation.

Importance

nice to have