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This widget can be used as a regular widget in a Tk application or can
be used as an autonomous popup widget that will display the content of a
data structure. The latter is like a call to a graphical =Data::Dumper=.

The scanner recognizes:
- tied hashes arrays or scalars
- weak reference (See weaken function of =Scalar::Util= for details)

This module was tested with perl5.8.2 and Tk 804.025 (beta). But
should work with older versions of perl (> 5.6.1) or Tk. On the other
hand, =data-viewer= requires Perl 5.16.

See the embedded documentation in the module for more details.

*Note* that test program (in the 't' directory) can be run interactively
this way :

#+begin_example
 perl t/xxx.t 1
#+end_example