[ruby-core:81811] [Ruby trunk Feature#13693] Allow String#to_i and / or Kernel::Integer to parse e-notation

Issue #13693 has been reported by sos4nt (Stefan Schテシテ殕er).

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Feature #13693: Allow String#to_i and / or Kernel::Integer to parse e-notation
https://bugs.ruby-lang.org/issues/13693

* Author: sos4nt (Stefan Schテシテ殕er)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
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`Kernel` can properly convert e-notation strings into numeric objects:

```ruby
     Float('1e+3') #=> 1000.0
  Rational('1e+3') #=> (1000/1)
   Complex('1e+3') #=> (1000.0+0i)
BigDecimal('1e+3') #=> 0.1e4
```

Same for `String`:

```ruby
'1e+3'.to_f #=> 1000.0
'1e+3'.to_r #=> (1000/1)
'1e+3'.to_c #=> (1000.0+0i)
'1e+3'.to_d #=> 0.1e4
```

With one exception:

```ruby
Integer('1e+3') #=> ArgumentError: invalid value for Integer(): "1e+3"
'1e+3'.to_i     #=> 1
```

Ruby should be able to convert e-notation strings to integers, too.



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