Function equal

docs/app/js/sanddance-app.js:142929–142931

(a, b)

    return (0, _vegaUtil.extend)(...args);
}
function equal(a, b) {
    return a === b || a !== a && b !== b ? true : (0, _vegaUtil.isArray)(a) ? (0, _vegaUtil.isArray)(b) && a.length === b.length ? equalArray(a, b) : false : (0, _vegaUtil.isObject)(a) && (0, _vegaUtil.isObject)(b) ? equalObject(a, b) : false;
}
function equalArray(a, b) {
    for(let i = 0, n = a.length; i < n; ++i){
        if (!equal(a[i], b[i])) return false;