Stepper: dynamic length not supported

[Etchelon]

I noticed that the Stepper component doesn't respond to a change in the length prop.
I have a complex form where some steps are visible based on what you select in previous steps, and the Stepper just breaks when some steps are added.
I am currently able to work around this by wrapping the whole stepper inside a {#key} block:

{#key steps}
    <Stepper active={activeStep$} length={steps.length} on:complete={save}>
        [...]
    </Stepper>
{/key}

where steps is an array of strings with the name of the steps to show.
I glimpsed at the source code and it's probably enough to turn the length context prop into a writable, which the stepper can update when its input prop changes.

[endigo9740]

We have a proposed rewrite to adjust a lot of the UI/UX of this component in the near future:

• Stepper component refactor #784

This would be useful to know during that process, so I'll link to this issue as reference. Thanks!