new page spacing syntax bug

[Janek Warchoł]

LilyPond 2.13.37, Windows 7.

system-system-spacing #'padding = #1
works like
system-system-spacing = #'((padding . 1))

(it resets other values to 0)

Snippet:

\version "2.13.37"
\paper {
    system-system-spacing #'padding = #1
}
\relative c' {
    \repeat unfold 40 { a d e f a }
}

this makes the score too vertically crowded than it should be (try
commenting third line out).

regards,
Janek