bug: trying to save while only changing `Meta.Keywords` erroneously returns "no changes"

[ramfox]

immediate guess would be that we do a shallow compare of the new & old meta component, and so don't compare the slice of keywords when we determine if a meta has changed.

API error response:

{
  "meta": {
    "code": 500,
    "error": "saving failed: no changes"
  }
}