aurelia hub navigation issue

Sorry if this is a wrong place to report issues with HUB.
If you navigate here http://aurelia.io/hub.html#/doc/article/aurelia/testing/latest/testing-components/1 and click on 'Testing custom component with a real view-model' section, navigation will be unsuccessful. If we manually scroll down to the section, this will be an URL: http://aurelia.io/hub.html#/doc/article/aurelia/testing/latest/testing-components/NaN. I think there is something with a section id generation.

Start by reproducing the navigation from the Aurelia HUB URL in the issue, selecting “Testing custom component with a real view-model,” and inspecting the generated section URL. Trace the HUB navigation and section ID generation from there; done means the link opens the intended section and no longer produces a URL ending in /NaN.

Written by the indexing model from the issue text.