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+With a block given, calls the block with each remaining character in the stream;
+positions the stream at end-of-file;
+returns +self+:
+
+ chars = []
+ strio = StringIO.new('hello')
+ strio.each_char {|char| chars.push(char) }
+ strio.eof? # => true
+ chars # => ["h", "e", "l", "l", "o"]
+
+ chars = []
+ strio = StringIO.new('こんにちは')
+ strio.each_char {|char| chars.push(char) }
+ chars # => ["こ", "ん", "に", "ち", "は"]
+
+Stream position matters:
+
+ chars = []
+ strio = StringIO.new('こんにちは')
+ strio.getc # => "こ"
+ strio.pos # => 3 # 3-byte character was read.
+ strio.each_char {|char| chars.push(char) }
+ chars # => ["ん", "に", "ち", "は"]
+
+When at end-of-stream does not call the block:
+
+ strio.eof? # => true
+ strio.each_char {|char| fail 'Boo!' }
+ strio.eof? # => true
+
+With no block given, returns a new {Enumerator}[rdoc-ref:Enumerator].