Subscript numbers result in invalid literal for int() with base 10

[Alex Hippel]

In the latest release when parsing only subscripted digits it seems to decide they are digits but then throws an exception: ValueError: invalid literal for int() with base 10.

This did not happen with an earlier release.

Code to reproduce:

from lxml import objectify
xml = """
<types>
<mytext>abc</mytext>
<mynum>123</mynum>
<mysuperscript>²²²²²²²²²²</mysuperscript>
</types>
"""
doc = objectify.fromstring(xml)
print(objectify.dump(doc))

Result in the latest release:

Traceback (most recent call last):
  File "/home/ubuntu/dev/scratch_18.py", line 11, in <module>
    print(objectify.dump(doc))
          ^^^^^^^^^^^^^^^^^^^
  File "src/lxml/objectify.pyx", line 1521, in lxml.objectify.dump
  File "src/lxml/objectify.pyx", line 1549, in lxml.objectify._dump
  File "src/lxml/objectify.pyx", line 1526, in lxml.objectify._dump
  File "src/lxml/objectify.pyx", line 646, in lxml.objectify.NumberElement.__repr__
  File "src/lxml/objectify.pyx", line 946, in lxml.objectify._parseNumber
ValueError: invalid literal for int() with base 10: '²²²²²²²²²²'

Not working with the following:
Python : sys.version_info(major=3, minor=11, micro=1, releaselevel='final', serial=0)
lxml.etree : (4, 9, 2, 0)
libxml used : (2, 9, 14)
libxml compiled : (2, 9, 14)
libxslt used : (1, 1, 35)
libxslt compiled : (1, 1, 35)

Working with the following:
Python : sys.version_info(major=3, minor=9, micro=4, releaselevel='final', serial=0)
lxml.etree : (4, 5, 1, 0)
libxml used : (2, 9, 4)
libxml compiled : (2, 9, 4)
libxslt used : (1, 1, 29)
libxslt compiled : (1, 1, 29)