Looks like this was a bug and is 
fixed: 
https://github.com/rails/rails/commit/8de7df5b22e853f028e5a71b26d45a0ce7a2c0f4#diff-da764be48e98c7b140730924b50595b0

On Friday, 10 November 2017 10:26:31 UTC, Kris wrote:
>
> key = 'foo'
>
> key.frozen? # => false
>
> TextFieldDefinition.create(key: key) 
>
> key.frozen? # => true (not expected)
>
>
> I created a minimal example 
> <https://gist.github.com/krisleech/017946a8c928c3f16ce1e54de09aab83#file-02_test-rb>
>  to demonstrate the bug this but it does not reproduce it.
>
>
> It appears that in my production code 
> `ActiveModel::Type::ImmutableString#cast_type`, which freezes the value, is 
> called, but isn't in my attempt at a reproduction of the bug.
>
>
> Any ideas?
>
>
> I'm assuming Rails shouldn't modify input's in any way and should `#dup` them 
> first.
>
>
> Many thanks.
>
>

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