There is no discussion of what -E does differently to -e.

Sure there is. Here's the relevant bit of perlrun:

-E commandline

behaves just like -e, except that it implicitly enables all optional features (in the main compilation unit). See feature.

In reply to Re: Difference between -e and -E when invoking Perl by hippo
in thread Difference between -e and -E when invoking Perl by adefaria

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