John-Li/my_programs — comment on commit 4c1b1c4a8cbb7173eeedb1f1a6dc17b0d5b6516f
File: book/specs/task-1-2_spec.rb line 5
By gmile:

Where did `0.89` came from?!

Generally yes, I can be anything, but here it should be `precision`, i.e. `0.1`, `0.01` etc. It means that the first argument (given it's an `x`) can very in:

```ruby
[x-precision, x+precision]
```