Much larger image with nano 2.1 compared to 1.0

Hi,

I'm busy with a new release of EmBlocks and I just updated the toolchain. I moved from nano-lib 1.0 to 2.1 and I notice a significant image increase.

Nanolib 1.0
Prog 9304
data 540
BSS 228

Nanolib 2.1
Prog 11736
data 1720
BSS 276

This is with the exact the same toolchain and options, only a nano lib difference.
Is this increase explainable?

Thanks