/*
 *  call-seq:
 *     index_reader.set_norm(doc_id, field, val)
 *
 *  Expert: change the boost value for a +field+ in document at +doc_id+.
 *  +val+ should be an integer in the range 0..255 which corresponds to an
 *  encoded float value.
 */
static VALUE
frt_ir_set_norm(VALUE self, VALUE rdoc_id, VALUE rfield, VALUE rval)
{
    IndexReader *ir = (IndexReader *)DATA_PTR(self);
    ir_set_norm(ir, FIX2INT(rdoc_id), frt_field(rfield), (uchar)NUM2CHR(rval));
    return self;
}