Accept an Array instead of an Iterable

Accepting an Iterable sounded good in theory, but in practice it's just easier to only accept an Array and if users have an Iterable, they can just spread it.

index.js

@@ -6,9 +6,8 @@ const cleanInternalStack = stack => stack.replace(/\s+at .*aggregate-error\/inde
 
 class AggregateError extends Error {
 	constructor(errors) {
-		// Even though strings are iterable, we don't allow them to prevent subtle user mistakes
-		if (!errors[Symbol.iterator] || typeof errors === 'string') {
-			throw new TypeError(`Expected input to be iterable, got ${typeof errors}`);
+		if (!Array.isArray(errors)) {
+			throw new TypeError(`Expected input to be an Array, got ${typeof errors}`);
 		}
 
 		errors = [...errors].map(error => {

readme.md

@@ -55,7 +55,7 @@ Returns an `Error` that is also an [`Iterable`](https://developer.mozilla.org/en
 
 #### errors
 
-Type: `Iterable<Error|Object|string>`
+Type: `Array<Error|Object|string>`
 
 If a string, a new `Error` is created with the string as the error message.<br>
 If a non-Error object, a new `Error` is created with all properties from the object copied over.