[ruby-core:30910] Reading From a Closed $stdin

In Ruby 1.8 it's possible to continue to read from $stdin, even if it has been previously closed (by a user feeding it Control-D).  In 1.9 attempt the same read just returns nil without trying to gather any input.  Here's an example:

$ cat eof_change.rb 
puts "Enter multiple lines:"
p $stdin.read

puts "Question?"
p $stdin.gets

__END__
$ ruby -v eof_change.rb 
ruby 1.8.6 (2010-02-05 patchlevel 399) [i686-darwin10.2.0]
Enter multiple lines:
one
two
three
"one\ntwo\nthree\n"
Question?
answer
"answer\n"
$ rvm use 1.9.2

info: Using ruby 1.9.2 preview3
$ ruby -v eof_change.rb 
ruby 1.9.2dev (2010-05-31 revision 28117) [x86_64-darwin10.3.0]
Enter multiple lines:
one
two
three
"one\ntwo\nthree\n"
Question?
nil

I ended both of the multi-line input requests above by pressing Control-D.

Is this an intentional change?

James Edward Gray II