as.numeric(levels(factor(x))) may be a decreasing sequence

Hi Waclav (and other interested parties),

I have committed my working version of src/main/coerce.c
so you can prepare your patch against that.
  

Hi Martin,

One quick reaction (which does not resolve my original complaint):  you
can have p non-const, and cast s to char* on the first occasion its
value is assigned to p, thus being able to copy from p to replace
without repetitive casts.  make check-ed patch atatched.

vQ
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