[Gimp-developer] image growing size - is it true? is it normal?

[Joseph Heled <pepster@xxxxxxxxxxxxxxxxxxxxx>]

Hi,

I open a 3038x2012 photo (gimp 2.2-pre1).
The caption below the image says 46.9 MB
I add a layer with Layer/New Layer. The caption says  70.3 MB
I delete the layer. Caption stays 70.3 MB
I Layer/New Layer again. The caption says: 93.7 MB
I delete the layer.  Caption stays 93.7 MB

Should I believe the numbers or not? I understand the gimp might be allocating 
memory and keeping it, but it does not mean the size of the image keep growing 
indefinitely? What am I missing?

Thanks, Joseph