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perl -v
This is perl 5, version 24, subversion 1 (v5.24.1)

perldoc experimental

The supported features, documented further below, are:

    array_base - allow the use of $[ to change the starting index of @
+array
    autoderef  - allow push, each, keys, and other built-ins on refere
+nces
    ...

Array and hash container functions accept references

...
Introduced in Perl 5.14.0

Removed in Perl 5.24.0