def replace_extension(self, dcmmeta_ext):
        self.remove_extension()
        self.nii_img.get_header().extensions.append(dcmmeta_ext)
        self.meta_ext = dcmmeta_ext
Cache the arp entries if device not ready.
dataset/ETHPy150Open moloney/dcmstack/src/dcmstack/dcmmeta.py/NiftiWrapper.replace_extension--crossover with--dataset/ETHPy150Open openstack/neutron/neutron/agent/l3/dvr_local_router.py/DvrLocalRouter._cache_arp_entry