Property binding check doesn't work in some cases

[adrienbaron]

If a child component is inserted using the is attribute its @Prop bindings are not validated.
For example, this error won't be caught at compile time:

<div is="my-todo" :todo="user"/>

Another problem is property binding is not checked when using camelCase properties instead of the kebab case version.
This also won't be caught at compile time:

<my-todo :todoItem="user"/>