Trying to think through this, so the idea is that the styles can define a default value for a type of style, but then override that style for specific types of tags (in this case, `rPr` tags)?

If that's the case, maybe we can change these names a bit to reflect that? Something like:

```
rPr_default = find_first(style, 'rPr')
styles_dict[style.attrib['styleId']] = {
    'default': style_val,
    'rPr': rPr_default,
}
```

Also, is this only the case for `rPr` tags, or might other tags have these kind of defaults?