docs: def _join_strings(x):
      """Joins adjacent Str elements found in the element list 'x'."""
      for i in range(len(x)-1):  # Process successive pairs of elements
          if x[i]['t'] == 'Str' and x[i+1]['t'] == 'Str':
              x[i]['c'] += x[i+1]['c']
              del x[i+1]  # In-place deletion of element from list
              return None  # Forces processing to repeat
      return True