[ruby-core:103706] [Ruby master Feature#17825] Uniformize Float::INFINITY and Date::infinity.new

Issue #17825 has been updated by nobu (Nobuyoshi Nakada).

Description updated

It's hard to remove that class because of marshal compatibility.

```diff
diff --git a/ext/date/lib/date.rb b/ext/date/lib/date.rb
index 65c34ace492..e96d102d7da 100644
--- a/ext/date/lib/date.rb
+++ b/ext/date/lib/date.rb
@@ -9,6 +9,8 @@
     false
   end
 
+  INFINITY = Float::INFINITY # :nodoc:
+
   class Infinity < Numeric # :nodoc:
 
     def initialize(d=1) @d = d <=> 0 end
@@ -60,4 +62,5 @@
 
   end
 
+  deprecate_constant :Infinity
 end
```

----------------------------------------
Feature #17825: Uniformize Float::INFINITY and Date::infinity.new
https://bugs.ruby-lang.org/issues/17825#change-91799

* Author: Aoernis (lucas billaudot)
* Status: Open
* Priority: Normal
----------------------------------------
With `Float` you can do 
``` ruby
Float::INFINITY # Infinity
```
and with `Date` you can do 
``` ruby
Date::Infinity.new # #<Date::Infinity:0x00007f8d46a59ee0 @d=1>
```
but not 
``` ruby
Date::INFINITY # uninitialized constant Date::INFINITY
```

#### Background

`Date::Infinity.new` and `Float::INFINITY` have both the same ancestors and have same using purpose
So it feel odd no be able to call them the same way

#### Proposal

Just make `Date::INFINITY` a working thing
And maybe mark `Date::Infinity.new` as deprecated ¯\_(ツ)_/¯

Thanks for reading




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