CommandShell on 1.2

On 1.2.2-12353 dev with the Mac 4.2.5 VM, evaluating:
  ExternalCommandShell open.

produces:
  NonBooleanReceiver: proceed for truth from BufferedAsyncFileReadStream>>moveAvailableDataFrom:. It seems that primTestEndOfFileFlag: is returning nil

Bug report...

2 June 2011 5:36:59 pm

VM: Mac OS - intel - 1067 - Squeak4.1 of 17 April 2010 [latest update: #9957] Squeak VM 4.2.5b1
Image: Pharo1.2.2 [Latest update: #12353]

SecurityManager state:
Restricted: false
FileAccess: true
SocketAccess: true
Working Dir /Users/sean/Squeak/Fresh Images/Pharo-1.2.2-12353
Trusted Dir /foobar/tooBar/forSqueak/bogus
Untrusted Dir /Users/sean/Library/Preferences/Squeak/Internet/My Squeak

UndefinedObject(Object)>>mustBeBooleanIn:
        Receiver: nil
        Arguments and temporary variables:
                context: BufferedAsyncFileReadStream>>moveAvailableDataFrom:
                proceedValue: nil
        Receiver's instance variables:
nil

UndefinedObject(Object)>>mustBeBoolean
        Receiver: nil
        Arguments and temporary variables:

        Receiver's instance variables:
nil

BufferedAsyncFileReadStream>>moveAvailableDataFrom:
        Receiver: BufferedAsyncFileReadStream: 'stdin'
        Arguments and temporary variables:
                sqFile: #[52 145 119 159 32 218 140 160 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0]
                bufferSize: 1000
                buffer: '