[ruby-core:76457] [Ruby trunk Feature#12334] Final/Readonly Support for Fields / Instance Variables

Issue #12334 has been updated by Shyouhei Urabe.


FYI we looked at this issue at yesterday's developer meeting.  I tried to support this for being a potential optimization hint, but failed because another attendee claimed we should focus to the feature as a language, not its implementation.  We didn't reach any consensus whether we should accept or reject this, though.

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Feature #12334: Final/Readonly Support for Fields / Instance Variables
https://bugs.ruby-lang.org/issues/12334#change-59700

* Author: Brady Wied
* Status: Open
* Priority: Normal
* Assignee: 
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This sort of relates to https://bugs.ruby-lang.org/issues/11911

C# through 'readonly' and Java through 'final' variables/fields allow me to only allow assigning a field in the initializer. It might be nice to embrace some controlled mutation by having this feature in Ruby. Sometimes its tempting in other methods to reassign a field but you really want to control that from the initializer.

Freezing targets a different problem by controlling what I can mutate within that field's object. The two can compliment each other but I see them as each solving a different problem. I know it's possible to freeze an entire instance of a class and not allow reassigning the field that way, but then I'm in an all or none situation where I can't have controlled mutation.



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