`extra-dicts` arg doesn't work with multiple dicts

[dgingrich]

ConfigKeys says extra-dicts takes a list:

>>> import aspell
>>> aspell.ConfigKeys()['extra-dicts']
('list', [], 'extra dictionaries to use')

But passing it as a list doesn't work:

>>> aspell.Speller(('extra-dicts', ['./a.dict', './b.dict']))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: argument 0: tuple of two strings (key, value) expeced

(Also a typo: expeced should be expected)

Passing a single dict does work for a single dict:

>>> aspell.Speller(('extra-dicts', './a.dict'))
<AspellSpeller object at 0x100991d50>

But ignores the first option if passed multiple times:

# Confirm that ./bad.dict doesn't exist
>>> aspell.Speller(('extra-dicts', './bad.dict'))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
aspell.AspellSpellerError: The file "./bad.dict" can not be opened for reading.

# But it's not opened if it's replaced by a later arg
>>> aspell.Speller(('extra-dicts', './bad.dict'), ('extra-dicts', './b.dict'))
<AspellSpeller object at 0x1008d1f70>

add-extra-dicts works:

>>> aspell.Speller(('add-extra-dicts', './a.dict'), ('add-extra-dicts', './b.dict'))
<AspellSpeller object at 0x1008d1f70>

# Check to make sure not silently skipping the first dict
>>> aspell.Speller(('add-extra-dicts', './bad.dict'), ('add-extra-dicts', './b.dict'))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
aspell.AspellSpellerError: The file "./bad.dict" can not be opened for reading.
>>> aspell.Speller(('add-extra-dicts', './bad.dict'), ('add-extra-dicts', './b.dict'))

But it's confusing since add-extra-dicts doesn't show up in ConfigKeys:

>>> aspell.ConfigKeys()['add-extra-dicts']
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
KeyError: 'add-extra-dicts'

[WojciechMula]

Thank you for the detailed report.