[ruby-core:96619] [Ruby master Bug#16470] Issue with nanoseconds in Time#inspect
From:
eregontp@...
Date:
2020-01-01 22:08:41 UTC
List:
ruby-core #96619
Issue #16470 has been updated by Eregon (Benoit Daloze).
I'd guess it partly due to the Float itself losing precision.
But indeed it's quite unpretty. Maybe we should use #rationalize since that's closer to the Float#inspect output?
There is a usability problem here, it's basically impossible to read the output of Time#inspect in such a case, even though the input was readable.
```ruby
123456.789.to_r
# => (8483885939586761/68719476736)
123456.789.rationalize
# => (123456789/1000)
Time.utc(2007, 11, 1, 15, 25, 0, 123456.789).inspect
# => "2007-11-01 15:25:00 8483885939586761/68719476736000000 UTC"
```
This works as expected (using `r` for making it an exact Rational):
```ruby
p Time.utc(2007, 11, 1, 15, 25, 0, 123456.789r)
# => 2007-11-01 15:25:00.123456789 UTC
```
----------------------------------------
Bug #16470: Issue with nanoseconds in Time#inspect
https://bugs.ruby-lang.org/issues/16470#change-83588
* Author: andrykonchin (Andrew Konchin)
* Status: Open
* Priority: Normal
* Assignee: matz (Yukihiro Matsumoto)
* Target version:
* ruby -v: 2.7
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
Recently in Ruby 2.7 nanoseconds were added to a string representation produced by the `Time#inspect` method.
I encountered an issue when was working on new specs for the RubySpec project - nanoseconds are displaying like a Rational.
Let's illustrate it with example:
```ruby
t = Time.utc(2007, 11, 1, 15, 25, 0, 123456.789)
t.inspect # => "2007-11-01 15:25:00 8483885939586761/68719476736000000 UTC"
```
But nanoseconds are stored correctly:
```ruby
t.nsec # => 123456789
t.strftime("%N") # => "123456789"
```
So `123456789` is formatted as `8483885939586761/68719476736000000` which equals `0.12345678900000001`.
I assume it isn't expected behavior and will be fixed.
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