@gerhobbelt/mathjax-third-party-extensions/legacy/siunitx/node_modules/arrify/index.js

A list of MathJax extensions provided by third-party contributors

'use strict';
module.exports = function (val) {
	if (val === null || val === undefined) {
		return [];
	}

	return Array.isArray(val) ? val : [val];
};