[issue1413] isinstance(source, str) should be isinstance(source, basestring)

[david priest]

New submission from david priest <davidp at meyersound.com>:

Testing against basestring permits use of unicode path names as well as ascii.  
See hg.py line 117 (def clone) for example of isinstance bug.

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messages: 8055
nosy: davidp
priority: bug
status: unread
title: isinstance(source, str) should be isinstance(source, basestring)

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<http://www.selenic.com/mercurial/bts/issue1413>
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