Function requesting

requesting('/things', {method: 'POST', body: {name: 'sand'}}, () => 'network error')
    .mBind(response => ...); // a body means stringify it and say it's JSON;
                             // status policy stays with the caller
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Cancelable end-to-end: bring no signal and requesting wires its own AbortController through onCancel, so the chain's cancel aborts the exchange at the network layer. Bring your own signal and it stays yours — cancel only silences.