Arabic: num2words(..., lang="ar") can fail with IndexError or InvalidOperation (instead of OverflowError)

[Jeronymous]

Expected Behaviour

num2words can sometimes fail with OverflowError on big numbers, that's fine.

But sometimes for Arabic language, it fails with other errors that seem to be bugs.

Actual Behaviour / Steps to reproduce

Here are two input which fails, with 2 different errors (IndexError / InvalidOperation).

from num2words import num2words

num2words(55772955305950220940549447929, lang="ar")

num2words(5577295530595022094054944792999999, lang="ar")

The first error is IndexError:

File ~/.local/lib/python3.10/site-packages/num2words/__init__.py:98, in num2words(number, ordinal, lang, to, **kwargs)
#      95 if to not in CONVERTES_TYPES:
#      96     raise NotImplementedError()
# ---> 98 return getattr(converter, 'to_{}'.format(to))(number, **kwargs)

# File ~/.local/lib/python3.10/site-packages/num2words/lang_AR.py:352, in Num2Word_AR.to_cardinal(self, number)
#     350 self.arabicSuffixText = ""
#     351 self.arabicOnes = ARABIC_ONES
# --> 352 return minus + self.convert(value=abs(number)).strip()

# File ~/.local/lib/python3.10/site-packages/num2words/lang_AR.py:205, in Num2Word_AR.convert(self, value)
#     203 self.number = "{:.9f}".format(value)
#     204 self.number_to_arabic(self.arabicPrefixText, self.arabicSuffixText)
# --> 205 return self.convert_to_arabic()

# File ~/.local/lib/python3.10/site-packages/num2words/lang_AR.py:241, in Num2Word_AR.convert_to_arabic(self)
#     238 else:
#     239     if ret_val != "":
#     240         ret_val = "{} {}".format(
# --> 241             self.arabicAppendedGroup[group],
#     242             ret_val)
#     243     else:
#     244         ret_val = "{} {}".format(
#     245             self.arabicGroup[group], ret_val)

# IndexError: list index out of range

The second one is InvalidOperation:

# ile ~/.local/lib/python3.10/site-packages/num2words/__init__.py:98, in num2words(number, ordinal, lang, to, **kwargs)
#      95 if to not in CONVERTES_TYPES:
#      96     raise NotImplementedError()
# ---> 98 return getattr(converter, 'to_{}'.format(to))(number, **kwargs)

# File ~/.local/lib/python3.10/site-packages/num2words/lang_AR.py:352, in Num2Word_AR.to_cardinal(self, number)
#     350 self.arabicSuffixText = ""
#     351 self.arabicOnes = ARABIC_ONES
# --> 352 return minus + self.convert(value=abs(number)).strip()

# File ~/.local/lib/python3.10/site-packages/num2words/lang_AR.py:205, in Num2Word_AR.convert(self, value)
#     203 self.number = "{:.9f}".format(value)
#     204 self.number_to_arabic(self.arabicPrefixText, self.arabicSuffixText)
# --> 205 return self.convert_to_arabic()

# File ~/.local/lib/python3.10/site-packages/num2words/lang_AR.py:222, in Num2Word_AR.convert_to_arabic(self)
#     217 group = 0
#     219 while temp_number > Decimal(0):
#     221     number_to_process = int(
# --> 222         Decimal(str(temp_number)) % Decimal(str(1000)))
#     223     temp_number = int(Decimal(temp_number) / Decimal(1000))
#     225     group_description = \
#     226         self.process_arabic_group(number_to_process,
#     227                                   group,
#     228                                   Decimal(floor(temp_number)))

# InvalidOperation: [<class 'decimal.DivisionImpossible'>]