Issue #12734 has been updated by Nobuyoshi Nakada.

Status changed from Open to Feedback

Please explain the use-case.
It doesn't seem useful to me.

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Feature #12734: `Array#flat?`
https://bugs.ruby-lang.org/issues/12734#change-60431

* Author: Stefan Schler
* Status: Feedback
* Priority: Normal
* Assignee: 
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It might be useful to have a method that determines whether an array is flat, i.e. one-dimensional.

~~~ruby
[1, 2, 3].flat?   #=> true
[1, [2, 3]].flat? #=> false
~~~

The result should be equivalent to `ary == ary.flatten` (without the overhead of actually flattening the array)



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