Sets the value to the object v_object.
v_object
a #GObject or %NULL.
Sets the value to the strv strv.
strv
the value to set, or %NULL
Sets the value to the #GVariant v_variant.
v_variant
If v_variant has a floating reference, it is consumed.
a #GVariant or %NULL.
Sets the value to the object
v_object
.