[procedure] values obj ...
In R5RS, all continuations take exactly one value, except for continuations created by the call-with-values procedure. However, the effect to pass the different number of values from what the continuation expects is undefined; some implementations may raise an exception, or some may simply ignores the excess values, etc.
R6RS mentions that (a) continuations of the non-final expressions (i.e. the expression whose value is discarded) takes any number of values, and (b) continuations of an expression evaluates to an argument of a procedure takes exactly one value. It also says that an exception is raised when different number of values are passed to the continuation.
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