header items: use #f or ##f ?

[-Eluze]

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
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