hc-radio-button doesn't support ngValue

[isaaclyman]

Summary

For all HTML elements that support the value attribute, Angular also provides the ngValue attribute, which allows binding non-string expressions to the value of a form element.

Cashmere's hc-radio-button is not a native HTML element, but the presence of the value field might lead Angular devs to expect that it also supports ngValue and that they work in the same way. This isn't true. When you try to use it, it silently fails: the attribute doesn't do anything and you don't see any console errors.

The value field on HcRadioButton supports any kind of data, not just strings, so ngValue isn't necessary. Still, it's an easy and automatic trap to fall into.

Reproduction

Steps to reproduce:

1. Use [ngValue] instead of [value] on an hc-radio-button.

Additional context

Related: #969, #963, #779 - it looks like we've previously addressed this with hc-select.