\afterGrace - afterGraceFraction [Lilypond 2.10.0 Windows]

[Trent J]

Hello,

I'm not sure whether I'm doing this right but the manual states to change 
the fraction of an afterGrace note(s):

The fraction 3/4 can be changed by setting afterGraceFraction, ie.

afterGraceFraction = #(cons 7 8). By setting does it mean \set 
afterGraceFraction = #(cons 7 8).

I've tried this and keep running into the following message from Lilypond:

warning: can't find property type-check for `afterGraceFraction' 
(translation-type?).  perhaps a typing error?
warning: doing assignment anyway


Any help appreciated.

Trent

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