`S3Path.touch` with `exist_ok=True` on existing file raises an error

[Koncopd]

S3Path.touch with exist_ok=True on existing file raises an error.
Here exist_ok=True sets truncate to False
and this raises the error here

On 0.1.4 it worked fine.

[ap--]

Thank you for opening the issue, @Koncopd .

Would you be interested in adding a test case for the touch behavior to the base tests?

Cheers,
Andreas

[Koncopd]

Yes, i can work on this.

[Koncopd]

I actually think that the current behavior is correct, and truncate=True should not be passed by default.
On the other hand it is strange that .touch(exist_ok=False) works fine on an existing file.