(Since Perl 5.8.1) Test whether STRING is in UTF-8 internally. Functionally the same as Encode::is_utf8().
* man perlapi
Returns true if first "len" bytes of the given string form a valid UTF-8 string, false otherwise. Note that 'a valid UTF-8 string' does not mean 'a string that contains code points above 0x7F encoded in UTF-8' because a valid ASCII string is a valid UTF-8 string.
DBD::Oracle uses ENV also and it's the Oracle client "style". It's good module. Play nice together with DateTime::Format::Pg and DateTime::Format::MySQL to be used by DBIx::Class::Storage::DBI->datetime_parser and DBIx::Class::InflateColumn::DateTime.