Sets the contents of a G_TYPE_PARAM GValue to param and takes over the ownership of the callers reference to param; the caller doesn't have to unref it any more. Since 2.4
the GParamSpec to be set. [allow-none]
See Implementation
Sets the contents of a G_TYPE_PARAM GValue to param and takes over the ownership of the callers reference to param; the caller doesn't have to unref it any more. Since 2.4