DeepDiff raises decimal exception when using significant digits

[yawhide]

Describe the bug
Comparing certain decimals with the significant_digits argument leads to an invalidDecimal exception from being raised within deep diff

To Reproduce

from decimal import Decimal

from deepdiff import DeepDiff


diff = DeepDiff([Decimal("999.99999999")], [Decimal("999.9999999999")], significant_digits=6)
# exception will raise

Expected behavior
There should be no exception and no values_changed

OS, DeepDiff version and Python version (please complete the following information):

• OS: mac os
• Version: 13.6
• Python Version: 3.11.4
• DeepDiff Version: 6.6.0

Additional context
Stack trace:

Traceback (most recent call last):
  File "/Users/stefan/code/coin-tracker/coin-tracker-server/testdeepdiff.py", line 6, in <module>
    diff = DeepDiff([Decimal("999.99999999")], [Decimal("999.9999999999")], significant_digits=6)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/stefan/code/coin-tracker/coin-tracker-server/.venv/lib/python3.11/site-packages/deepdiff/diff.py", line 311, in __init__
    self._diff(root, parents_ids=frozenset({id(t1)}), _original_type=_original_type)
  File "/Users/stefan/code/coin-tracker/coin-tracker-server/.venv/lib/python3.11/site-packages/deepdiff/diff.py", line 1569, in _diff
    self._diff_iterable(level, parents_ids, _original_type=_original_type, local_tree=local_tree)
  File "/Users/stefan/code/coin-tracker/coin-tracker-server/.venv/lib/python3.11/site-packages/deepdiff/diff.py", line 655, in _diff_iterable
    self._diff_iterable_in_order(level, parents_ids, _original_type=_original_type, local_tree=local_tree)
  File "/Users/stefan/code/coin-tracker/coin-tracker-server/.venv/lib/python3.11/site-packages/deepdiff/diff.py", line 761, in _diff_iterable_in_order
    self._diff_ordered_iterable_by_difflib(
  File "/Users/stefan/code/coin-tracker/coin-tracker-server/.venv/lib/python3.11/site-packages/deepdiff/diff.py", line 902, in _diff_ordered_iterable_by_difflib
    self._diff_by_forming_pairs_and_comparing_one_by_one(
  File "/Users/stefan/code/coin-tracker/coin-tracker-server/.venv/lib/python3.11/site-packages/deepdiff/diff.py", line 887, in _diff_by_forming_pairs_and_comparing_one_by_one
    self._diff(next_level, parents_ids_added, local_tree=local_tree)
  File "/Users/stefan/code/coin-tracker/coin-tracker-server/.venv/lib/python3.11/site-packages/deepdiff/diff.py", line 1551, in _diff
    self._diff_numbers(level, local_tree=local_tree, report_type_change=report_type_change)
  File "/Users/stefan/code/coin-tracker/coin-tracker-server/.venv/lib/python3.11/site-packages/deepdiff/diff.py", line 1360, in _diff_numbers
    t1_s = self.number_to_string(level.t1,
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/stefan/code/coin-tracker/coin-tracker-server/.venv/lib/python3.11/site-packages/deepdiff/helper.py", line 397, in number_to_string
    number = number.quantize(Decimal('0.' + '0' * significant_digits))
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
decimal.InvalidOperation: [<class 'decimal.InvalidOperation'>]

I dont quite understand why your code doesnt work. When i try to reproduce outside of your library, i dont have issues:

from decimal import Decimal
n = Decimal('999.999999999')
n.quantize(Decimal('0.' + '0' * 6))
# => Decimal('1000.000000')

[seperman]

Hi @yawhide
It is because the count of the significant digits of the rounded value for 999.9999999 is one digit above precision of the context.

>>> with localcontext() as ctx:
...     ctx.prec = 9
...     Decimal('999.99999999').quantize(Decimal('0.000000'))
...
Traceback (most recent call last):
  File "<stdin>", line 3, in <module>
decimal.InvalidOperation: [<class 'decimal.InvalidOperation'>]
>>>
>>> with localcontext() as ctx:
...     ctx.prec = 10
...     Decimal('999.99999999').quantize(Decimal('0.000000'))
...
Decimal('1000.000000')

[yawhide]

oh that makes sense. thanks for the quick fix!

[seperman]

Sure!