Issue #9278 has been updated by Hiroshi SHIBATA.

Target version changed from 2.1.0 to current: 2.2.0

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Feature #9278: Magic comment "immutable: string" makes "literal".freeze the default for that file
https://bugs.ruby-lang.org/issues/9278#change-44731

* Author: Colin Kelley
* Status: Open
* Priority: Normal
* Assignee: 
* Category: core
* Target version: current: 2.2.0
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Building on https://bugs.ruby-lang.org/issues/9042, this pull request adds the magic comment # -*- immutable: string -*- that implies .freeze on every string literal in the file. To get a mutable string in a file that starts with the magic comment, use String.new or ''.dup.

Here is a corresponding github pull request:

    https://github.com/ruby/ruby/pull/487

For more details, background, and rationale, please see this blog post:

    http://development.invoca.com/magic-comment-immutable-string-makes-ruby-2-1s-literal-freeze-optimization-the-default/



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