From: "jemmai (Jemma Issroff) via ruby-core" <ruby-core@...>
Date: 2023-12-13T17:59:23+00:00
Subject: [ruby-core:115731] [Ruby master Bug#20063] Inconsistent behavior with required vs optional parameters

Issue #20063 has been reported by jemmai (Jemma Issroff).

----------------------------------------
Bug #20063: Inconsistent behavior with required vs optional parameters
https://bugs.ruby-lang.org/issues/20063

* Author: jemmai (Jemma Issroff)
* Status: Open
* Priority: Normal
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN
----------------------------------------
Using repeated anonymous parameters, gives different behavior with the parameters in the same order based on whether they are required or optional.
 
```
def example_with_optional(_a = 1, _a = 2)
  _a
end

def example_with_required(_a, _a)
  _a
end

p example_with_optional # 2
p example_with_required(1, 2) # 1
```

It is unexpected that these two methods would return differently given the parameters are in the same order, based on whether they are optional or required.




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