Ti.Codec.encodeNumber halting Simulator

Hi ...

I'm having some issues with Ti.Codec.encodeNumber. When the following code is run in STEP mode, the simulator (iOS) hangs when executing the encodeNumber method.

This code is take right from the Buffer Codec guide, so I assume it should work.

I have also tried setting the type in the buffer to match the encoding.

Thoughts??

Thanks

Running iOS 6.1 with SDK 3.1.2GA

// Encode a 4 byte integer into position 10 using BIG_ENDIAN encoding
var buffer = Ti.createBuffer({ length: 100 });
Ti.Codec.encodeNumber({
    source: 0x3456789a,
    dest: buffer,
    position: 10,
    type: Ti.Codec.TYPE_INT,
    byteOrder: Ti.Codec.BIG_ENDIAN
});
 
Ti.API.info(buffer.toString());

and modified as below

// Encode a 4 byte integer into position 10 using BIG_ENDIAN encoding
var buffer = Ti.createBuffer({ length: 100,type:Ti.Codec.TYPE_INT });
Ti.Codec.encodeNumber({
    source: 0x3456789a,
    dest: buffer,
    position: 10,
    type: Ti.Codec.TYPE_INT,
    byteOrder: Ti.Codec.BIG_ENDIAN
});
 
Ti.API.info(buffer.toString());