every time the export list changes in Foo::Core, it has to be updated in Foo::Core::Specialized.

Why? Why not just initialise F::C::S's EXPORT* vars from F::C's? 

package Foo::Core::Specialised;
use Foo::Core ':all';

our @EXPORT = @Foo::Core:@EXPORT;
our @EXPORT_OK = @Foo::Core::EXPORT_OK;
our %EXPORT_TAGS = %Foo::Core::EXPORT_TAGS;

## Add, subtract or overwrite as required.

[download]

That way F::C::S can export everything F::C can unless you explicitly remove it--self maintaining--plus anything you add or overwrite.

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
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In reply to Re^3: Creating "parasitic" exports by BrowserUk
in thread Creating "parasitic" exports by sirrobert

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