[ruby-core:98867] [Ruby master Feature#16470] Issue with nanoseconds in Time#inspect

Issue #16470 has been updated by shyouhei (Shyouhei Urabe).


Note that the cryptic output does not happen for `Time.now.utc`.

```ruby
Time.now.utc.inspect # => "2020-06-18 11:12:44.354669166 UTC"
```

Nor when you pass `123456.789r` for `Time.utc`.

```ruby
Time.utc(2007, 11, 1, 15, 25, 0, 123456.789r) # => "2007-11-01 15:25:00.123456789 UTC"
```

So yes, as @eregon pointed out, this is not an issue of `Time#inspect`.  This is due to the OP is using `123456.789` for some reason not shown in the report.  `Time#inspect` is just trying to express as much as it can.

Is this usage (passing Float instances instead of Rationals) major in some area?  If so we might want to improve `Time.utc`'s API, not `Time#inspect`.

----------------------------------------
Feature #16470: Issue with nanoseconds in Time#inspect
https://bugs.ruby-lang.org/issues/16470#change-86232

* Author: andrykonchin (Andrew Konchin)
* Status: Open
* Priority: Normal
* Assignee: matz (Yukihiro Matsumoto)
----------------------------------------
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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