The data-router-ignore is introduced to play nice with another Aurelia feature: automatic data attribute creation.
<a href="/some/link" data-router-ignore.bind="condition || null">Conditional Skip Hijacking</a>
Here Aurelia will dynamically add/remove attribute data-router-ignore when condition changes. Note || null is necessary because Aurelia only removes the data attribute when the bound value becomes null or undefined, it doesn't remove the data attribute when bound value is 0 or "" or even false.
In comparison, <a href="/some/link" router-ignore.bind="condition || null">Does not work</a> does NOT add/remove attribute router-ignore. Aurelia only does that for data- or aria- attributes.
