From: usa@...
Date: 2015-12-08T02:33:39+00:00
Subject: [ruby-core:71927] [Ruby trunk - Feature #11785] [Open] add `encoding:` optional argument to `String.new`

Issue #11785 has been reported by Usaku NAKAMURA.

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Feature #11785: add `encoding:` optional argument to `String.new`
https://bugs.ruby-lang.org/issues/11785

* Author: Usaku NAKAMURA
* Status: Open
* Priority: Normal
* Assignee: 
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I propose to add `encoding:` optional argument to `String.new`.

Ruby doesn't have the syntax to specify the encoding of a string literal.
So we're using `String#force_encoding` for the purpose when writing m17n script, just like:

~~~Ruby
str = "\xA4\xA2".force_encoding('euc-jp')
~~~

But when using `frozen-string-literal: true`, `force_encoding` to literals raise RuntimeError.
So, we must write like:

~~~Ruby
str = "\xA4\xA2".dup.force_encoding('euc-jp')
~~~

or, if don't prefer `dup`,

~~~Ruby
str = String.new("\xA4\xA2").force_encoding('euc-jp')
~~~

but these are very unshapely.
To begin with, using `force_encoding` would be the cause of the unshapliness.

Therefore, I propose `encoding:` optional argument of `String.new`.
If it's available, we can write:

~~~Ruby
str = String.new("\xA4\xA2", encoding: 'euc-jp')
~~~

This was proposed at the developer meeting on the last August and was generally favorably accepted (in my impression), but was forgotten after it.




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