A generic function coercing an R object to an
environment. A number or a character string is
converted to the corresponding environment on the search path.
an R object to convert. If it is already an
environment, just return it. If it is a positive number, return the
environment corresponding to that position on the search list. If it
If it is a list, the equivalent of
The corresponding environment object.
This is a primitive function.
environment for creation and manipulation,
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