[Python] ValueError: Exceeds the limit (4300) for integer string conversion

>>> import sys
>>> sys.set_int_max_str_digits(4300) # Illustrative, this is the default.
>>> _ = int('2' * 5432)
Traceback (most recent call last):
...
ValueError: Exceeds the limit (4300) for integer string conversion: value has 5432 digits.​

Python 3.10.7 introduced this breaking change for type conversion.

Documentation: Integer string conversion length limitation

Actually I don't understand why

1. this was introduced and
2. where does the default value of 4300 come from? Sounds like an arbitrary number.

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