[ruby-core:98915] [Ruby master Feature#16470] Issue with nanoseconds in Time#inspect

Issue #16470 has been updated by Eregon (Benoit Daloze).


One consideration here is performance.
For instance `Time.at(Float)` is quite slow, due to going through Rational, etc.
Could you measure the other methods you changed to see how they perform compared to before?

----------------------------------------
Feature #16470: Issue with nanoseconds in Time#inspect
https://bugs.ruby-lang.org/issues/16470#change-86295

* Author: andrykonchin (Andrew Konchin)
* Status: Open
* Priority: Normal
* Assignee: matz (Yukihiro Matsumoto)
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Ruby 2.7 added nanosecond representation to the return value of `Time#inspect` method.

Nanosecond is displayed as `Rational` as in the following example:

```ruby
t = Time.utc(2007, 11, 1, 15, 25, 0, 123456.789)
t.inspect # => "2007-11-01 15:25:00 8483885939586761/68719476736000000 UTC"
```

The nanosecond value `8483885939586761/68719476736000000` can be expanded to `0.12345678900000001`. This is different from the stored nanosecond:

```ruby
t.nsec # => 123456789
t.strftime("%N") # => "123456789"
```

I assume it isn't expected, and will be fixed.



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