How differs the open pragma with different utf8?

Question

Do these three versions all behave differently?

use open qw( :encoding(UTF-8) :std );  
use open qw( :encoding(UTF8) :std );  
use open qw( :utf8 :std );  
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Answer 1

Evan seems to have your answer. For future ease of use see uft8::all, "turn on Unicode - all of it".