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tbl() is the standard constructor for tbls. as.tbl() coerces, and is.tbl() tests.
tbl()
as.tbl()
is.tbl()
make_tbl(subclass, ...)
name of subclass. "tbl" is an abstract base class, so you must supply this value. tbl_ is automatically prepended to the class name
tbl_
For tbl(), other fields used by class. For as.tbl(), other arguments passed to methods.
to test/coerce.