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Implements a Perl 5 native version of what the Perl 6 symbol export mechanism
will look like.
It's very straightforward:
* If you want a subroutine to be capable of being exported (when
explicitly requested in the use arguments), you mark it with the
:Export attribute.
* If you want a subroutine to be automatically exported when the module
is used (without specific overriding arguments), you mark it with the
:Export(:DEFAULT) attribute.
* If you want a subroutine to be automatically exported when the module
is used (even if the user specifies overriding arguments), you mark it
with the :Export(:MANDATORY) attribute.
* If the subroutine should also be exported when particular export
groups are requested, you add the names of those export groups to the
attribute's argument list.
That's it.
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