On 6/13/2016 5:59 PM, Levi Morrison wrote: > My opinion is contrary: the union type is the cleaner solution as it > does not require special casing machinery in the engine. >
I am a huge fan of the union types but this is such a common requirement that it requires a pseudo compound type in my opinion. The special casing in the engine is trivial: https://github.com/php/php-src/pull/1941 I also hope that this allows expansion in internals and enable us to rewrite existing functions from array to iterable and directly iterate them without special casing. Furthermore I argue the we need more of those pseudo compound types that are special in internals and userland and I might implemented them if I am ever going to be granted some Karma: number := is_numeric || is_int || is_float stringable := is_string || method_exists(__toString) These three things cannot even be easily expressed with union types. (Well, the last one can if one creates a Stringable interface and you end up having string|Stringable :P) -- Richard "Fleshgrinder" Fussenegger
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