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Rev 88657 Rev 90259
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  polynomial term in a model.
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  polynomial term in a model.
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  When \code{Boundary.knots} are set \emph{inside} \code{range(x)},
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  When \code{Boundary.knots} are set \emph{inside} \code{range(x)},
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  \code{bs()} now uses a \sQuote{pivot} inside the respective boundary
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  \code{bs()} now uses a \sQuote{pivot} inside the respective boundary
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  knot which is important for derivative evaluation.  In \R versions
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  knot which is important for derivative evaluation.  In \R versions
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  \eqn{\le}{<=} 3.2.2, the boundary knot itself had been used as
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  \eqn{\le} 3.2.2, the boundary knot itself had been used as
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  pivot, which lead to somewhat wrong extrapolations.
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  pivot, which lead to somewhat wrong extrapolations.
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  When used in a model \code{\link{formula}} containing a \code{subset = *}
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  When used in a model \code{\link{formula}} containing a \code{subset = *}
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  part, the \code{x} in \code{bs(x)} is evaluated before subsetting which
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  part, the \code{x} in \code{bs(x)} is evaluated before subsetting which
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  may lead to unexpected results.  For more information see the
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  may lead to unexpected results.  For more information see the