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// Given something array like (or null), returns something that is strictly an
// array. This is used to ensure that array-like objects passed to d3.selectAll
// or selection.selectAll are converted into proper arrays when creating a
// selection; we don’t ever want to create a selection backed by a live
// HTMLCollection or NodeList. However, note that selection.selectAll will use a
// static NodeList as a group, since it safely derived from querySelectorAll.
export default function array(x) {
return x == null ? [] : Array.isArray(x) ? x : Array.from(x);
}