f acts as a standard S3-style generic
a function object
A closure is considered a standard S3 generic if the first expression
in its body calls
UseMethod. Functions which perform
operations before calling
UseMethod will not be considered
“standard” S3 generics.
f is currently being traced, i.e., inheriting from class
"traceable", the definition of the original untraced version of
the function is used instead.
f is an S3 generic, a logical containing
with the name of the S3 generic (the string passed to
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