Compared with former updates to Polkadot, JAM won't be released by way of a gradual iterative method. The migration will take place suddenly and at the time it is done, it's finished. ^ a b "polka", Oxford English Dictionary, On account of the popularity with the dance, polka was prefixed https://cesarqzjsh.bcbloggers.com/29715147/the-best-side-of-polkadot-cookies-and-cream