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  Specifying a size of \code{Inf} sets the limit to the maximal possible
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  Specifying a size of \code{Inf} sets the limit to the maximal possible
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  value for the platform.
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  value for the platform.
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  The default maximal values are unlimited on most platforms, but can be
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  The default maximal values are unlimited on most platforms, but can be
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  adjusted using environment variables as described in
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  adjusted using environment variables as described in
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  \code{\link{Memory}}. On Mac OS a lower default vector heap limit is
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  \code{\link{Memory}}. On macOS a lower default vector heap limit is
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  used to protect against the \R process being killed when Mac OS
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  used to protect against the \R process being killed when macOS
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  over-commits memory.
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  over-commits memory.
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  Adjusting the maximal number of nodes is rarely necessary. Adjusting
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  Adjusting the maximal number of nodes is rarely necessary. Adjusting
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  the vector heap size limit can be useeful on Mac OS in particular but
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  the vector heap size limit can be useful on macOS in particular but
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  should be done with caution.
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  should be done with caution.
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}
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}
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\value{
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\value{
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  The current or new value, in Mb for \code{mem.maxVSize}. \code{Inf} is
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  The current or new value, in Mb for \code{mem.maxVSize}. \code{Inf} is
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  returned if the current value is unlimited.
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  returned if the current value is unlimited.