Unintended behaviour in absltest.py

It seems like this section of code allows someone to pass in an arbitrary path name in tempfile, which then causes the code to zero out the provided path (rather than a temporary file) if the person running the test also happens to own the file: https://github.com/abseil/abseil-py/blob/976413320682f8fd1c05c36f24a9475050702699/absl/testing/absltest.py#L390-L396
Example:
```
import pathlib

from adric-work.testing.pybase import test

class BugTest(test.TestCase):

def testBug(self):
# bad_path = pathlib.Path.home() / 'hello_bug' / 'a_file.txt'
# my_file = self.create_tempfile(bad_path.as_posix())
bad_path = '/usr/local/work/home/adric-work/hello_bug/a_file.txt'
my_file = self.create_tempfile(bad_path)

if __name__ == '__main__':
test.main()
```