[Vala] Future-proofing ABI - how to add dummy v-methods to Vala classes

[Maciej Piechotka <uzytkownik2 gmail com>]

Hi,

What is recommended way of adding dummy v-methods to classes (IIUC that
is not an issue for GObject interfaces as size of V-table is not part of
ABI for interfaces)?

Just adding reserved v-method (if yes how to prevent it from appearing
in gir/vapi)?

    public virtual void reserved1(void);

Best regards