[Rd] Is there any way to check the class of an ALTREP?

[Jiefei Wang]

Hi all,

I would like to determine if an ALTREP object is from my package, I see
there is a function `ALTREP_CLASS` defined in RInternal.h but its return
value is neither a `R_altrep_class_t` object nor an STRSXP representing a
class name. I do not know how to correctly use it. Any suggestions?

Thanks,
Jiefei

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