Ruby 1.9.1 vs 1.9.2 disasm diffs

★ rvm use 1.9.1

Now using ruby 1.9.1 p376

★ irb
irb(main):001:0> def a(x,y) x.send(y) end; puts RubyVM::InstructionSequence.disasm(method(:a))
== disasm: <RubyVM::InstructionSequence:a@(irb)>========================
local table (size: 3, argc: 2 [opts: 0, rest: -1, post: 0, block: -1] s1)
[ 3] x<Arg>     [ 2] y<Arg>     
0000 trace            8                                               (   1)
0002 trace            1
0004 getlocal         x
0006 getlocal         y
0008 send             :send, 1, nil, 256, <ic>
0014 trace            16
0016 leave            
=> nil
irb(main):002:0> quit
★ rvm use 1.9.2

Now using ruby 1.9.2 preview1

★ irb
irb(main):001:0> def a(x,y) x.send(y) end; puts RubyVM::InstructionSequence.disasm(method(:a))
== disasm: <RubyVM::InstructionSequence:a@(irb)>========================
local table (size: 3, argc: 2 [opts: 0, rest: -1, post: 0, block: -1] s1)
[ 3] x<Arg>     [ 2] y<Arg>     
0000 trace            8                                               (   1)
0002 trace            1
0004 getlocal         x
0006 getlocal         y
0008 send             :send, 1, nil, 0, <ic>
0014 trace            16
0016 leave            
=> nil