:utf8 and :encoding(UTF-8) do indeed different things - the former does less strict checking, which is why the latter is recommended. See also: UTF8 related proof of concept exploit released at T-DOSE.

Update: to encourage the better practice of using :encoding(UTF-8) by default, the perl 5 porters have changed the core documentation in nearly every place - except where :utf8 itself is explained.

Perl 6 - second systems done right

In reply to Re: different utf8 method = different behaviour? by moritz
in thread different utf8 method = different behaviour? by erwan

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