NR 4.1.6: blank-last-page-force and penalty values

[Federico Bruni]

NR 4.1.6, \paper variable for page breaking
http://lilypond.org/doc/v2.15/Documentation/notation/other-_005cpaper-variables#_005cpaper-variables-for-page-breaking

I'd like to force the add of a blank page in case the number of pages in 
a book is odd.
I guess I should use blank-last-page-force.

I had a look at ly/paper-defaults-init.ly to see the default values and 
I see that penalty values are numbers.
Default value of blank-last-page-force is 0, so I guess that as I 
increase the number it's more likely to get the blank page.

But I can't make it working.
See attached minimal example: what's wrong?


I'm CCing the bug squad because there might be a doc issue here, since I 
couldn't found any explanation of penalty values in NR. I googled this 
string:
penalty site:http://lilypond.org/doc/v2.15/Documentation/notation/

Also, the definition is not very clear, because it doesn't say 
explicitly what it actually does.. you have to guess it:

###
blank-last-page-force
The penalty for ending the score on an odd-numbered page.
###


Thanks
--
Federico

book.ly
Description: Text Data