From: Yukihiro Matsumoto <matz@...>
Date: 2010-03-12T18:36:27+09:00
Subject: [ruby-core:28626] Re: [Bug #1893] Recursive Enumerable#join is 	surprising

Hi,

In message "Re: [ruby-core:28625] Re: [Bug #1893] Recursive Enumerable#join is 	surprising"
    on Fri, 12 Mar 2010 18:17:16 +0900, Yusuke ENDOH <mame@tsg.ne.jp> writes:

|When you say two objects are "almost equivalent", do you expect duck
|typing?  If they behave the same enough, we can directly call #each,
|#[], #[]=, etc. without calling #to_ary.

|Is #to_ary just for performance?  If so, I think we should handle an
|array-like object as an array even if it doesn't provide #to_ary.

The whole purpose of to_ary, to_str etc, is to support implicit type
conversion for Array/String-like objects into real Array/String for C
defined functions which requires legit typing.  By String/Array-like
object, I mean Delegators, for example.  So in a sense, it's for
performance, by allowing C functions to bypass method invocation.

							matz.