That is incorrect. "utf8" is an extension to UTF-8 used by Perl internally. "UTF-8" is the standard encoding. (The names are case-insensitive.)

I have no idea why that pages says they are equivalent. They are not. See :encoding(UTF-8) vs :encoding(utf8) vs :utf8.

In reply to Re^3: using binmode() to override default encoding specified in "use open" by ikegami
in thread using binmode() to override default encoding specified in "use open" by raygun

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