The DATA filehandle is always used to access the text after the token, no matter if it is the __END__ or the __DATA__ token. The perldata man page gives a few important details that you should be aware of.
I had always believed that __END__ should be used in the top-level script, with __DATA__ used only in code compiled via require or do. After re-reading the perldata man page I am of the opinion that the __DATA__ token is similar to the __END__ token but with extra features and that its use in the top-level script is fine.
Someone please correct me if I'm wrong.
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