String inputs fail conversion for some languages

[noahw3]

Expected Behaviour

When passing in a string parameter, it's expected to be handled the same as if an integer parameter was passed.

Actual Behaviour

Because the input gets turned into a Decimal in init if it's a string, this causes failures in any language implementation that assumes the input will be an integer.

Specifically I ran into an issue with the Italian converter - it attempts to perform arithmetic on the input, and then use those results to index the word arrays. However, because those arithmetic results are Decimal and not int, it throws an error.

TypeError: list indices must be integers or slices, not decimal.Decimal

I haven't tested any other languages, but they may have a similar problem. Notably this issue doesn't exist for the en implementation.

Steps to reproduce

Pass in any string input to the Italian converter.

num2words.num2words(str(34234), lang='it', to='cardinal')