Bug 2460576

Description of problem:
Package python-meshio fails to build from source in Fedora Rawhide.

Version-Release number of selected component (if applicable):
5.3.5-9.fc44

Steps to Reproduce:
koji build --scratch f45 python-meshio-5.3.5-9.fc44.src.rpm

Additional info:
This package is tracked by Koschei. See:
https://koschei.fedoraproject.org/package/python-meshio

Reproducible: Always

Actual Results:
__________ test_read_from_file[01_raw_binary_int64.vtu-tetra-162-64] ___________
filename = PosixPath('/builddir/build/BUILD/python-meshio-5.3.5-build/meshio-5.3.5/tests/meshes/vtu/01_raw_binary_int64.vtu')
ref_cells = 'tetra', ref_num_cells = 162, ref_num_pnt = 64
    @pytest.mark.parametrize(
        "filename, ref_cells, ref_num_cells, ref_num_pnt",
        [
            ("00_raw_binary.vtu", "tetra", 162, 64),
            ("01_raw_binary_int64.vtu", "tetra", 162, 64),
            ("02_raw_compressed.vtu", "tetra", 162, 64),
        ],
    )
    def test_read_from_file(filename, ref_cells, ref_num_cells, ref_num_pnt):
        this_dir = pathlib.Path(__file__).resolve().parent
        filename = this_dir / "meshes" / "vtu" / filename
    
>       mesh = meshio.read(filename)
               ^^^^^^^^^^^^^^^^^^^^^
tests/test_vtu.py:76: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
../BUILDROOT/usr/lib/python3.14/site-packages/meshio/_helpers.py:71: in read
    return _read_file(Path(filename), file_format)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
../BUILDROOT/usr/lib/python3.14/site-packages/meshio/_helpers.py:103: in _read_file
    return reader_map[file_format](str(path))
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
../BUILDROOT/usr/lib/python3.14/site-packages/meshio/vtu/_vtu.py:577: in read
    reader = VtuReader(filename)
             ^^^^^^^^^^^^^^^^^^^
../BUILDROOT/usr/lib/python3.14/site-packages/meshio/vtu/_vtu.py:389: in __init__
    piece_cells[data_array.attrib["Name"]] = self.read_data(
../BUILDROOT/usr/lib/python3.14/site-packages/meshio/vtu/_vtu.py:558: in read_data
    data = reader(self.appended_data[offset:], dtype)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
../BUILDROOT/usr/lib/python3.14/site-packages/meshio/vtu/_vtu.py:448: in read_uncompressed_binary
    byte_string = base64.b64decode(data)
                  ^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
s = b'QBQAAAAAAAAAAAAAAAAAAAEAAAAAAAAAAgAAAAAAAAADAAAAAAAAAAAAAAAAAAAAAQAAAAAAAAADAAAAAAAAAAQAAAAAAAAAAAAAAAAAAAACAAAAAAAA...oKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgo='
altchars = None, validate = False
    def b64decode(s, altchars=None, validate=False):
        """Decode the Base64 encoded bytes-like object or ASCII string s.
    
        Optional altchars must be a bytes-like object or ASCII string of length 2
        which specifies the alternative alphabet used instead of the '+' and '/'
        characters.
    
        The result is returned as a bytes object.  A binascii.Error is raised if
        s is incorrectly padded.
    
        If validate is False (the default), characters that are neither in the
        normal base-64 alphabet nor the alternative alphabet are discarded prior
        to the padding check.  If validate is True, these non-alphabet characters
        in the input result in a binascii.Error.
        For more information about the strict base64 check, see:
    
        https://docs.python.org/3.11/library/binascii.html#binascii.a2b_base64
        """
        s = _bytes_from_decode_data(s)
        if altchars is not None:
            altchars = _bytes_from_decode_data(altchars)
            assert len(altchars) == 2, repr(altchars)
            s = s.translate(bytes.maketrans(altchars, b'+/'))
>       return binascii.a2b_base64(s, strict_mode=validate)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
E       binascii.Error: Invalid base64-encoded string: number of data characters (8889) cannot be 1 more than a multiple of 4
/usr/lib64/python3.14/base64.py:85: Error
___________ test_read_from_file[02_raw_compressed.vtu-tetra-162-64] ____________
filename = PosixPath('/builddir/build/BUILD/python-meshio-5.3.5-build/meshio-5.3.5/tests/meshes/vtu/02_raw_compressed.vtu')
ref_cells = 'tetra', ref_num_cells = 162, ref_num_pnt = 64
    @pytest.mark.parametrize(
        "filename, ref_cells, ref_num_cells, ref_num_pnt",
        [
            ("00_raw_binary.vtu", "tetra", 162, 64),
            ("01_raw_binary_int64.vtu", "tetra", 162, 64),
            ("02_raw_compressed.vtu", "tetra", 162, 64),
        ],
    )
    def test_read_from_file(filename, ref_cells, ref_num_cells, ref_num_pnt):
        this_dir = pathlib.Path(__file__).resolve().parent
        filename = this_dir / "meshes" / "vtu" / filename
    
>       mesh = meshio.read(filename)
               ^^^^^^^^^^^^^^^^^^^^^
tests/test_vtu.py:76: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
../BUILDROOT/usr/lib/python3.14/site-packages/meshio/_helpers.py:71: in read
    return _read_file(Path(filename), file_format)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
../BUILDROOT/usr/lib/python3.14/site-packages/meshio/_helpers.py:103: in _read_file
    return reader_map[file_format](str(path))
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
../BUILDROOT/usr/lib/python3.14/site-packages/meshio/vtu/_vtu.py:577: in read
    reader = VtuReader(filename)
             ^^^^^^^^^^^^^^^^^^^
../BUILDROOT/usr/lib/python3.14/site-packages/meshio/vtu/_vtu.py:389: in __init__
    piece_cells[data_array.attrib["Name"]] = self.read_data(
../BUILDROOT/usr/lib/python3.14/site-packages/meshio/vtu/_vtu.py:558: in read_data
    data = reader(self.appended_data[offset:], dtype)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
../BUILDROOT/usr/lib/python3.14/site-packages/meshio/vtu/_vtu.py:448: in read_uncompressed_binary
    byte_string = base64.b64decode(data)
                  ^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
s = b'QBQAAAAAAAAAAAAAAAAAAAEAAAAAAAAAAgAAAAAAAAADAAAAAAAAAAAAAAAAAAAAAQAAAAAAAAADAAAAAAAAAAQAAAAAAAAAAAAAAAAAAAACAAAAAAAA...oKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgo='
altchars = None, validate = False
    def b64decode(s, altchars=None, validate=False):
        """Decode the Base64 encoded bytes-like object or ASCII string s.
    
        Optional altchars must be a bytes-like object or ASCII string of length 2
        which specifies the alternative alphabet used instead of the '+' and '/'
        characters.
    
        The result is returned as a bytes object.  A binascii.Error is raised if
        s is incorrectly padded.
    
        If validate is False (the default), characters that are neither in the
        normal base-64 alphabet nor the alternative alphabet are discarded prior
        to the padding check.  If validate is True, these non-alphabet characters
        in the input result in a binascii.Error.
        For more information about the strict base64 check, see:
    
        https://docs.python.org/3.11/library/binascii.html#binascii.a2b_base64
        """
        s = _bytes_from_decode_data(s)
        if altchars is not None:
            altchars = _bytes_from_decode_data(altchars)
            assert len(altchars) == 2, repr(altchars)
            s = s.translate(bytes.maketrans(altchars, b'+/'))
>       return binascii.a2b_base64(s, strict_mode=validate)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
E       binascii.Error: Invalid base64-encoded string: number of data characters (8889) cannot be 1 more than a multiple of 4
/usr/lib64/python3.14/base64.py:85: Error