[ruby-core:94987] [Ruby master Feature#16021] floor/ceil/round/truncate should accept a :step argument

Issue #16021 has been updated by akr (Akira Tanaka).


`Time.now.floor(step: 3600)` doesn't work well with leap seconds.

Also, we want floor/round/ceil for month and year
but one month and one year is not fixed number of seconds.
So, step with number of seconds doesn't for month and year.
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Feature #16021: floor/ceil/round/truncate should accept a :step argument
https://bugs.ruby-lang.org/issues/16021#change-81607

* Author: Dan0042 (Daniel DeLorme)
* Status: Feedback
* Priority: Normal
* Assignee: =

* Target version: =

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These rounding methods currently accept a number of (decimal) digits, but a=
 more general mechanism would allow rounding to the nearest =BC, multiple o=
f 5, etc.
Equivalent to e.g. `((num / step.to_f).round * step)`

``` ruby
12.3456.floor(step: 0.2) #=3D> 12.2
12.3456.round(step: 0.2) #=3D> 12.4
12.3456.floor(step: 0.2) #=3D> 12.4
12.3456.floor(step: 0.2) #=3D> 12.2
```

IMHO this should also apply to Time#floor/round/ceil

``` ruby
Time.now.floor(step: 3600) #=3D> current hour
Time.now.round(step: 3600) #=3D> nearest hour
Time.now.ceil(step: 3600)  #=3D> next hour
```

We can also consider that instead of `:step` , `:by` or `:to` might be quit=
e readable.

``` ruby
12.3456.round(by: 0.2) #=3D> 12.4
12.3456.round(to: 0.2) #=3D> 12.4
```



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