Javascript D3 Scale在v6中工作，但在v7中不工作

const range = [0, 828.156];
const domain = [[300,1],[300,2],[300,3],[400,1],[400,2],[400,3],[400,4]]
const scale = d3.scaleBand()
  .domain(domain)
  .range(range);

// test 1: this works in both v6 and v7
const a = domain[3];
console.log('array a', a);
console.log('scaled a:', scale(a));

// test 2: declaring a new, identical array to the one above, 
// also works in v6
const b = [400, 1];
console.log('array b', b);
console.log('scaled b:', scale(b));

<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/6.7.0/d3.min.js" integrity="sha512-cd6CHE+XWDQ33ElJqsi0MdNte3S+bQY819f7p3NUHgwQQLXSKjE4cPZTeGNI+vaxZynk1wVU3hoHmow3m089wA==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>

const range = [0, 828.156];
const domain = [[300,1],[300,2],[300,3],[400,1],[400,2],[400,3],[400,4]]

const scale = d3.scaleBand()
  .domain(domain)
  .range(range);

// test 1: this works in both v6 and v7
const a = domain[3];
console.log('array a', a);
console.log('scaled a:', scale(a));

// test 2:  declaring a new, identical array to the one above, 
// does not work in v7, but it does work in v6
const b = [400, 1];
console.log('array b', b);
console.log('scaled b:', scale(b));

<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/7.9.0/d3.min.js" integrity="sha512-vc58qvvBdrDR4etbxMdlTt4GBQk1qjvyORR2nrsPsFPyrs+/u5c3+1Ct6upOgdZoIl7eq6k3a1UPDSNAQi/32A==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>