why is Perl Build-Essential: yes?

[Jonathan Dowland]

"apt-cache show perl" lists it as "Build-Essential: yes". But why? It's 
not in the transitive dependencies of build-essential, nor 
/usr/share/doc/build-essential/list, and I can't find that header 
verbatim in Perl's debian/control in the source, nor in the binary (I 
checked perl_5.40.1-3_amd64.deb with dpkg-deb -I)

Thanks,

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👱🏻      Jonathan Dowland
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