Slightly improve WITH-OUTPUT-TO-STRING.
Slightly improve WITH-OUTPUT-TO-STRING.

rvedam/Mezzano,froggey/Mezzano,varjagg/Mezzano,rvedam/Mezzano,AugustusHuang/Mezzano,AugustusHuang/Mezzano,froggey/Mezzano,varjagg/Mezzano