Issue 1610 in lilypond: header items : #f vs. ##f

[lilypond]

Status: Accepted
Owner: ----
Labels: Type-Defect Priority-Low

New issue 1610 by address@hidden: header items : #f vs. ##f
http://code.google.com/p/lilypond/issues/detail?id=1610

should not all header items behave the same? at least they did earlier -  
with
copyright = #f i had no error before version 2.13.48!

\version "2.13.56"
\header {

 % works only with ##f
 title = ##f
 subtitle = ##f
 copyright = ##f
 poet = ##f
 composer = ##f
 arranger = ##f

 % works with #f and ##f
 tagline = #f
 dedication = #f
 subsubtitle = #f
 instrument = #f
 meter = #f
 piece = #f
 opus = #f
 breakbefore = #f
}
{ a b c }

and if you happen to misspell ##f the error message is not very helpful:

Layout output to `test.ps'...ERROR: Wrong type (expecting pair): #<Prob:
Music C++: Music((text . f))((display-methods #<procedure #f (event
parser)>) (name . AbsoluteDynamicEvent) (types general-music event
dynamic-event absolute-dynamic-event)) >

cheers
Eluze