[ruby-core:82889] [Ruby trunk Feature#13919] Add a new method to create Time instances from unix time and nsec

Issue #13919 has been updated by tagomoris (Satoshi TAGOMORI).


`Time.at_nsec` is ok for me, but it seems to take just one argument of nano seconds from epoch.

* `Time.at_nsec(nsec_from_epoch)`
* `Time.at_nsec(seconds_from_epoch, nsec)`

Is it not confusing? Or should it get exactly two arguments?

----------------------------------------
Feature #13919: Add a new method to create Time instances from unix time and nsec
https://bugs.ruby-lang.org/issues/13919#change-66788

* Author: tagomoris (Satoshi TAGOMORI)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
----------------------------------------
Time object contains `nsec`, but Time class doesn't have method to create an instance with nsec.
Time.at() accepts 2nd argument, but it's micro-sec, and we need to divide nsec by 1000.0.

```ruby
t1 = Time.now
t1.nsec #=> nsec value

t2 = Time.at(t1.to_i, t1.usec) # not nsec!
t3 = Time.at(t1.to_i, t1.nsec / 1000.0) # additional division
```

I think it's better to have another method to create an instance from time(unix time) and nsec, for example, `Time.of(unix_time, nsec)`

```ruby
t = Time.now
Time.of(t.to_i, t.nsec) == t
```




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