extern void gr_stylespec_unset(GrStyleSpec *spec, GrAttr a);
extern bool gr_stylespec_add(GrStyleSpec *spec, GrAttr a, uint score);
extern bool gr_stylespec_append(GrStyleSpec *dst, const GrStyleSpec *src);
extern void gr_stylespec_unset(GrStyleSpec *spec, GrAttr a);
extern bool gr_stylespec_add(GrStyleSpec *spec, GrAttr a, uint score);
extern bool gr_stylespec_append(GrStyleSpec *dst, const GrStyleSpec *src);