Check if this version of R is as new as the current release version of R.
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How severe should the consequences of the assertion be?
A string giving the URL of the CRAN repository to check.
An object of class
R_system_version giving the current release
version of R.
Development versions of R can have versions higher than the current
release version of R. For convenience, these will return
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# This example is marked "don't test" since it requires an # internet connection and is potentially long running is_r_current()