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To: PHP Internals <internals@lists.php.net>
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Date: Thu, 16 Jul 2015 16:42:20 +0100
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Subject: Re: [PHP-DEV] Consolidation of Traversable and array operations
From: rowan.collins@gmail.com (Rowan Collins)

Levi Morrison wrote on 16/07/2015 16:23:

> People have talked about creating types like so:
>
> type Iterable = array | Traversable;
>
> which could then be used as normal:
>
> function foo(Iterable $f);

I kind of like this idea.

> Why special case a pseudo-type if we can have a generic
> way of making them in user-land?

Well, for the same reason as large amounts of the core library exist 
(and PHP's is small compared to some): standardisation and ease of use. 
I think "array | Traversable" is a common enough use-case that it 
deserves a built-in name, even if a userland naming system is available.

Regards,
-- 
Rowan Collins
[IMSoP]