Issue #12602 has been updated by wizardofogz (Andy Ogzewalla).


I think this is a good addition to make behavior of numeric types consistent. Is there a reason this was not done initially?

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Feature #12602: Add NilClass#to_d
https://bugs.ruby-lang.org/issues/12602#change-67225

* Author: Domon (Chun-wei Kuo)
* Status: Assigned
* Priority: Normal
* Assignee: mrkn (Kenta Murata)
* Target version: 
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`bigdecimal/util` adds a `#to_d` method to many native classes, as a shortcut to converting them to `BigDecimal`, e.g.

```ruby
require 'bigdecimal'
require 'bigdecimal/util'

1.23.to_d  # => #<BigDecimal:7fa4f11f0958,'0.123E1',18(36)>
```

However, `#to_d` is not added to `NilClass`:

```ruby
nil.to_d  # => NoMethodError: undefined method `to_d' for nil:NilClass
```

While `to_i`, `to_f`, etc. works on `nil`:

```ruby
nil.to_i  # => 0
nil.to_f  # => 0.0
```

I think it is reasonable to make `to_d` behave more like its counterparts.

Therefore, I tried implementing the `NilClass#to_d` method in `bigdecimal/util` with a test.
The method always returns `0` in `BigDecimal`.

Please see attached patch.

Thanks! :)



---Files--------------------------------
add-nil-to-d.patch (1.34 KB)


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