Expected Behaviour

num2words.num2words(101300, lang='es')
'ciento un mil trescientos'

Actual Behaviour

num2words.num2words(101300, lang='es')
'ciento uno mil trescientos'

In spanish "un" is used in a lot of cases instead of "uno". A few more examples:
31000 should be: treinta y un mil
891003 should be: ochocientos noventa y un mil tres

In this kind of cases it's being returned as "uno" instead of "un". I tested with all 3 spanish options and all 3 had the problem.