code: def precompute(config, soups):
    
    show_toc = config.get('show_toc', {})
    page = {}
    pantsrefs = precompute_pantsrefs(soups)
    for p, soup in soups.items():
      title = get_title(soup) or p
      page[p] = PrecomputedPageInfo(title=title, show_toc=show_toc.get(p, True))
    return Precomputed(page=page, pantsref=pantsrefs)
docs: Return info we want to compute (and preserve) before we mutate things.