[Rd] is.vector could handle AsIs class better

Jan Gorecki j@goreck| @end|ng |rom w|t@edu@p|
Sun Mar 29 15:29:12 CEST 2020

Dear R-devel,

AsIs class seems to be well handled by `typeof` and `mode` function.
Those two functions are being referred when explaining `is.vector`
behaviour in manual. Yet `is.vector` does not seem to be handling AsIs
class the same way.

#[1] TRUE
#[1] FALSE

Is there any reason behind this behaviour?
Could we have it supported so AsIs class is ignored when `is.vector`
is doing its job?

Best Regards,
Jan Gorecki

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