[ruby-core:75850] [Ruby trunk Feature#12039] Fixnum#infinite?/Bignum#infinite or Numeric#infinte, consistent with Float#infinite? and BigDecimal#infinite?

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Issue #12039 has been updated by Samuel Williams.


This looks good, do you think we can integrate this at some point? What do we need to do?

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Feature #12039: Fixnum#infinite?/Bignum#infinite or Numeric#infinte, consistent with Float#infinite? and BigDecimal#infinite?
https://bugs.ruby-lang.org/issues/12039#change-59025

* Author: Samuel Williams
* Status: Open
* Priority: Normal
* Assignee: 
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We have an issue where it is not easy to ask if a number is +ve or -ve infinity. https://github.com/rails/arel/issues/411

Both Float and BigDecimal do respond to infinite? but Integer derivatives don't. It sort of makes sense, since we don't have an infinity value for Fixnum/Bignum. However, it makes polymorphic code hard.

```
[13] pry(main)> Float::INFINITY.infinite?                                       
=> 1
[14] pry(main)> -Float::INFINITY.infinite?                                      
=> -1
[15] pry(main)> BigDecimal::INFINITY.infinite?                                  
=> 1
[16] pry(main)> -BigDecimal::INFINITY.infinite?                                 
=> -1
```

Given a Numeric value x, it would be nice to query if it is INFINITY or not. Propose adding a default implementation to Numeric, which always returns false or nil.



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