When class(order.by) has a length other than one, it will reach this
line but only the first element will be used. We should make this
explicit and indeed must in case the environment variable R_CHECK_LENGTH_1_LOGIC2 is set, whereupon this line will emit an error
Only the first element of class(order.by) is used in the if statement.
This will emit an error or warning when the environment variable
_R_CHECK_LENGTH_1_LOGIC2_ is true. We should make this explicit to
avoid the error or warning.
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