| otype | R Documentation | 
Determine object type.
otype(x)
| x | object to determine type of | 
Figure out which object system an object belongs to:
base: no class attribute
S3: class attribute, but not S4
 S4: isS4, but not RC
RC: inherits from "refClass"
Other object inspection: 
ftype(),
sexp_type()
otype(data.frame())
otype(1:10)
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