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+Calls the given block with each successive character from +self+;
+returns +self+:
+
+ 'hello'.each_char {|char| print char, ' ' }
+ print "\n"
+ 'тест'.each_char {|char| print char, ' ' }
+ print "\n"
+ 'こんにちは'.each_char {|char| print char, ' ' }
+ print "\n"
+
+Output:
+
+ h e l l o
+ т е с т
+ こ ん に ち は
+
+Returns an enumerator if no block is given.