From: zn@...
Date: 2019-07-12T03:50:17+00:00
Subject: [ruby-core:93706] [Ruby master Bug#15987] Let `exception` option in `Kernel#Complex`, `Kernel#Float`, `Kernel#Integer`, `Kernel#Rational` be falsy vs. truthy

Issue #15987 has been updated by znz (Kazuhiro NISHIYAMA).


I think `nil` means default behavior.

```
Integer("")                   # => ArgumentError
Integer("", exception: nil)   # => ArgumentError
Integer("", exception: true)  # => ArgumentError
Integer("", exception: false) # => nil
```

```
system("")                   # => nil
system("", exception: nil)   # => nil
system("", exception: true)  # => Errno::ENOENT
system("", exception: false) # => nil
```


----------------------------------------
Bug #15987: Let `exception` option in `Kernel#Complex`, `Kernel#Float`, `Kernel#Integer`, `Kernel#Rational` be falsy vs. truthy
https://bugs.ruby-lang.org/issues/15987#change-79332

* Author: sawa (Tsuyoshi Sawada)
* Status: Closed
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
The `exception` option in `Kernel#Complex`, `Kernel#Float`, `Kernel#Integer`, and `Kernel#Rational` distinguishes `false` vs. other values.

```ruby
Integer("z", exception: false) #=> nil
Integer("z", exception: nil) #>> ArgumentError: invalid value for Integer(): "z")
```

But in most other cases where a boolean notion is concerned (for example, the `chomp` option in `Kernel#gets`), the distinction is between falsy vs. truthy values.

I request the distinction to be falsy vs. truthy. In other words, I would like the value `nil` to work on the falsy side rather than the truthy side like this.

```ruby
Integer("z", exception: false) #=> nil
Integer("z", exception: nil) #=> nil
```




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