IO#read

irb(main):001:0> file = File.open( 'test.1', 'w+')
=> #<File:test.1>
irb(main):002:0> file.write( '1234')
=> 4
irb(main):003:0> file.read(1)
=> nil
irb(main):004:0> file.read
=> ""
irb(main):005:0> file.read(1)
=> nil
irb(main):006:0>

Why does IO#read at the end of file without argument return "", but with a
interer return nil?

---------------------------------------------------------------- IO#read
     ios.read([integer [, buffer]])    => string, buffer, or nil
------------------------------------------------------------------------
     Reads at most _integer_ bytes from the I/O stream, or to the end of
     file if _integer_ is omitted or is +nil+. If the optional _buffer_
     argument is present, it must reference a String, which will receive
     the data. Returns +nil+ if called at end of file.

Is it bug?

-- 
Kirill A. Shutemov				Belarus, Minsk
E-mail:	k.shutemov (AT) sam-solutions.net
JID: kas (AT) altlinux.org
ICQ: 152302675

If Beethoven's Seventh Symphony is not by some means abridged, it will soon
fall into disuse.
		-- Philip Hale, Boston music critic, 1837