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Add Modern Perl headers. Perl 5.16 is still fairly old from 2012. Enable UTF-8, warnings and make script 'strict' Small fixes for perlcritic reported problems and some crashes I/O layer ":utf8" used at line 268, column 16. Use ":encoding(UTF-8)" to get strict validation. (Severity: 5) "return" statement with explicit "undef" at line 806, column 4. See page 199 of PBP. (Severity: 5) "return" statement with explicit "undef" at line 6844, column 4. See page 199 of PBP. (Severity: 5) "return" statement with explicit "undef" at line 7524, column 4. See page 199 of PBP. (Severity: 5) "return" statement with explicit "undef" at line 7527, column 4. See page 199 of PBP. (Severity: 5) "return" statement with explicit "undef" at line 7599, column 4. See page 199 of PBP. (Severity: 5) "return" statement with explicit "undef" at line 7602, column 4. See page 199 of PBP. (Severity: 5) Expression form of "eval" at line 7784, column 4. See page 161 of PBP. (Severity: 5) Expression form of "eval" at line 7806, column 4. See page 161 of PBP. (Severity: 5) Glob written as <...> at line 8016, column 25. See page 167 of PBP. (Severity: 5) "return" statement followed by "sort" at line 9195, column 60. Behavior is undefined if called in scalar context. (Severity: 5) Expression form of "eval" at line 9846, column 10. See page 161 of PBP. (Severity: 5)