[ruby-core:112821] [Ruby master Feature#19094] `sleep(nil)` vs `sleep()` and replicating the default implementation.

10 Mar 2023

      Issue #19094 has been updated by ioquatix (Samuel Williams).

Status changed from Open to Closed

Merged.

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Feature #19094: `sleep(nil)` vs `sleep()` and replicating the default implementation.
https://bugs.ruby-lang.org/issues/19094#change-102328

* Author: ioquatix (Samuel Williams)
* Status: Closed
* Priority: Normal
* Assignee: ioquatix (Samuel Williams)
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```
...
sleep(nil)
(irb):1:in `sleep': can't convert NilClass into time interval (TypeError)

However, I feel that this makes implementing a compatible sleep method a little difficult.

```ruby
def sleep(time = nil)
  if time
    sleep_some(time)
  else
    sleep_forever
  end
end

Can we consider allowing `sleep(nil)` and `sleep(false)` to be the same as `sleep()` to simplify this behaviour?

Otherwise, it's hard to proxy (e.g. fiber scheduler, or even just a plain old variable argument).

e.g.

```ruby
class Sleeper
  def initialize(time = nil)
    @time = time
  end

  def sleep
    Kernel::sleep(@time) # Hard to get the behaviour of `sleep()` here without explicitly handling/checking.
  end
end
```

-- 
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