This retrieves the built-in R object representing the value
of an unbound variable, i.e. an undefined value.
This can be returned by the
of an object table if it does not have a definition for the
requested variable. This makes it easy to handle such cases
in the R code rather than in the underlying C-level interface
that glues the internal engine and the user-level object table implementations.
Returns the internal C-level value of
Duncan Temple Lang <[email protected]>
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