[Rd] binary form of is() contradicts its unary form

[Iñaki Úcar]

2017-11-30 13:26 GMT+01:00 Suzen, Mehmet <mehmet.suzen at gmail.com>:
> On 30 November 2017 at 11:37, Iñaki Úcar <i.ucar86 at gmail.com> wrote:
>> 2017-11-30 3:14 GMT+01:00 Suzen, Mehmet <mehmet.suzen at gmail.com>:
>>> My understanding is that there is no inconsistency. `is` does what it
>>> claims, from the documentation:
>>>
>>> ‘is’: With two arguments, tests whether ‘object’ can be treated as
>>>           from ‘class2’.
>>>
>>>           With one argument, returns all the super-classes of this
>>>           object's class.
>>
>> Note that this is not in the documentation since a year ago.
>>
>
> As far as I understood and gather, starting from methods v3.3.2, the following
> new reference is added:
>
> * Chambers, John M. (2016) Extending R, Chapman & Hall. (Chapters 9 and 10.)
>
> Pushing that details there, I assume.

Am I supposed to read every reference on a man page just to know what
to expect from a function?

Iñaki