Fix cancel methods
Fix cancel methods

rcrowder/pycapnp,tempbottle/pycapnp,SymbiFlow/pycapnp,rcrowder/pycapnp,jparyani/pycapnp,tempbottle/pycapnp,rcrowder/pycapnp,tempbottle/pycapnp,jparyani/pycapnp,SymbiFlow/pycapnp,SymbiFlow/pycapnp,jparyani/pycapnp,tempbottle/pycapnp,rcrowder/pycapnp,jparyani/pycapnp,SymbiFlow/pycapnp