[ruby-core:116482] [Ruby master Misc#20222] Dedup-ing clarification

Issue #20222 has been reported by kddnewton (Kevin Newton).

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Misc #20222: Dedup-ing clarification
https://bugs.ruby-lang.org/issues/20222

* Author: kddnewton (Kevin Newton)
* Status: Open
* Priority: Normal
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``` ruby
source = %q{"foo".freeze.equal?("foo".freeze)}

RubyVM::InstructionSequence.compile(source).eval # => true
RubyVM::InstructionSequence.compile_option = false
RubyVM::InstructionSequence.compile(source).eval # => false
```

`"foo".freeze` uses `opt_str_freeze` when optimizations are turned on, which also deduplicates. This means this code has different behavior depending on if optimizations are turned on or off.

To be clear, I'm not saying whether or not this is a problem. I'm asking if this is desired behavior?



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