Issue #12958 has been reported by Rafael Frana.

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Bug #12958: Breaking change in how `#round` works
https://bugs.ruby-lang.org/issues/12958

* Author: Rafael Frana
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: 
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
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We noticed in the Rails test suite that there is a breaking change in how `#round` works between 2.3 and 2.4

https://github.com/rails/rails/pull/27091

Is that desirable?

I think it is may cause a lot of problem if the behavior of `#round` without any arguments changes between a minor version.



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