[ruby-core:118979] [Ruby master Feature#20705] Should "0.E-9" be a valid float value?

["kou (Kouhei Sutou) via ruby-core" <ruby-core@ml.ruby-lang.org>]

Issue #20705 has been reported by kou (Kouhei Sutou).

----------------------------------------
Feature #20705: Should "0.E-9" be a valid float value?
https://bugs.ruby-lang.org/issues/20705

* Author: kou (Kouhei Sutou)
* Status: Open
----------------------------------------
Ruby doesn't accept "0.E-9" as a valid float value:

```console
$ ruby -e 'Float("0.E-9")'
<internal:kernel>:218:in 'Kernel#Float': invalid value for Float(): "0.E-9" (ArgumentError)
	from -e:1:in '<main>'
```

But other systems accept "0.E-9" as a valid float value:

PostgreSQL:

```text
=> select 0.E-9;
  ?column?   
-------------
 0.000000000
(1 row)
```

MySQL:

```text
> select 0.E-9;
+-------+
| 0.E-9 |
+-------+
|     0 |
+-------+
1 row in set (0.00 sec)
```

Python:

```console
$ python3 -c 'print(0.E-9)'
0.0
```

Node.js:

```console
$ nodejs -e 'console.log(0.E-9)'
0
```

Should Ruby accept "0.E-9" as a valid float value?

FYI: I don't have an opinion of this. I just realized this by an issue from an user of a maintained library by me: https://github.com/apache/arrow/issues/43877



-- 
https://bugs.ruby-lang.org/
 ______________________________________________
 ruby-core mailing list -- ruby-core@ml.ruby-lang.org
 To unsubscribe send an email to ruby-core-leave@ml.ruby-lang.org
 ruby-core info -- https://ml.ruby-lang.org/mailman3/lists/ruby-core.ml.ruby-lang.org/