[BUG] transport/memory.py doesn't handle strings

[Aaron Bentley]

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Robert Collins wrote:
|>It looked fine last I checked.  It was iterating up to the root, and
|>stopping there.  If you substituted transport('a') for transport('..')
|>in that loop, I'd expect it to be infinite.
|
|
| I think we should modify transport so that
| 'LocalTransport('/').clone('..') raises an exception.

That would be inconsistent with with web server behavior and with POSIX
~ filesystem behavior.  Both treat /.. as /.

Aaron
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