b2e94f611f
Prior to this commit, if a single null value was passed to a method with a varargs array of type java.util.Optional, that null value was passed unmodified. On the contrary, a null passed with additional values to such a method resulted in the null being converted to Optional.empty(). This commit ensures that a single null value is also converted to Optional.empty() for such SpEL expressions. Closes gh-27795
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