```Issue #16021 has been updated by shevegen (Robert A. Heiler).

Hmm. I have mixed feelings about the proposal. I think in principle it
would be ok to add more flexibility as such (e. g. :step or :by, although
I think :step is a strange name). At the same time, though, this proposal
makes the use of .floor() etc... a bit more complicated. People have to
think more than before, such as by the example shown by shyouhei.

12.3456.floor(step: 0.0002)

versus

12.3456.floor(3)

(Not the same, I know, but my point is mostly that the second usage is =

much easier to understand from a glance alone.)

I do not want to be discouraging but personally I more prefer to retain
the current way only.

Note that I have no really substantial opinion on the Time.now examples
given above - haven't thought about its usage implications yet. I mostly
refer to e. g. .floor() etc... on numbers.

----------------------------------------
Feature #16021: floor/ceil/round/truncate should accept a :step argument
https://bugs.ruby-lang.org/issues/16021#change-80059

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

* Target version: =

----------------------------------------
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` might be quite readabl=
e.

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

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