@observablehq/inspector/src/array.js

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// TODO https://twitter.com/mbostock/status/702737065121742848
export function isarray(value) {
  return Array.isArray(value)
      || value instanceof Int8Array
      || value instanceof Int16Array
      || value instanceof Int32Array
      || value instanceof Uint8Array
      || value instanceof Uint8ClampedArray
      || value instanceof Uint16Array
      || value instanceof Uint32Array
      || value instanceof Float32Array
      || value instanceof Float64Array;
}

// Non-integer keys in arrays, e.g. [1, 2, 0.5: "value"].
export function isindex(key) {
  return key === (key | 0) + "";
}