$spread signature should require an object as anything else is nonsensical

[wnm3]

The signature for spread is <x-:a> which allows for odd returns like:
$spread("a") -> "a"
$spread(1) -> 1
$spread([]) -> null
$spread([1]) -> [1]
I think the initial parameter should be o for object and reject any of these cases as a bad arg1...
e.g.,:

 <(oa<o>)-:a<o>>

[wnm3]

In particular, I would remove the else { return = arg; } from below and change the signature to reject anything but an object to throw the T0410 exception.

/**
 * Splits an object into an array of object with one property each
 * @param {*} arg - the object to split
 * @returns {*} - the array
 */
function spread(arg) {
    var result = createSequence();

    if (Array.isArray(arg)) {
        // spread all of the items in the array
        arg.forEach(function (item) {
            result = append(result, spread(item));
        });
    } else if (arg !== null && typeof arg === 'object' && !isLambda(arg)) {
        for (var key in arg) {
            var obj = {};
            obj[key] = arg[key];
            result.push(obj);
        }
    // } else {
        // result = arg;
    }
    return result;
}

[andrew-coleman]

Yes, I think I agree with this - certainly the last bit about removing the final else clause.