1. 5.10
  2. 5.10
  3. The following (non-core!) pragmas disable some more or less unwanted aspects of Perl. I probably forgot a few.
  4. Starting with 5.10, use version enables the feature pragma. Read that documentation carefully. So far, feature only enabled new stuff, or enabled stuff that was deprecated and removed. The semantics of feature are supposed to support disabling stuff, and I will be delighted to discover how future Perls handle this.
Related: How can I test when a feature was added to Perl?

In reply to Re^3: Summary of salient changes to Perl 5 between the major releases? by daxim
in thread Summary of salient changes to Perl 5 between the major releases? by Anonymous Monk

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