#19642: django.utils.functional.lazy issues
------------------------------+------------------------------
     Reporter:  void          |      Owner:  nobody
         Type:  Bug           |     Status:  new
    Component:  Core (Other)  |    Version:  master
     Severity:  Normal        |   Keywords:  lazy, functional
 Triage Stage:  Unreviewed    |  Has patch:  0
Easy pickings:  0             |      UI/UX:  0
------------------------------+------------------------------
 I've found some issues meditating on the `lazy()` function. I'm reporting
 them as one ticket; please tell if I should rather create one per issue.

 * promise, returned by `lazy()`, has no attributes of original class:
 `lazy()` thinks only about methods
 * promise, returned by `lazy()`, has weird behaviour if resultclass has
 `__mod__` method – it overrides it completely
 * methods of promise, returned by `lazy()`, lack the `__doc__` attribute –
 docstring is lost
 * if resultclass explicitly define itself as a not hashable with `__hash__
 = None`, promises of that class may still be hashable.

 Following diff, when applied, adds four failing tests illustrating that
 issues: https://gist.github.com/4582334

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Ticket URL: <https://code.djangoproject.com/ticket/19642>
Django <https://code.djangoproject.com/>
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