bc657eb4d5
Prior to this commit, if a SpEL expression invoked a method or registered function that declares a String varargs argument, there were sometimes issues with converting the input arguments into the varargs array argument. Specifically, if the expression supplied a single String argument containing a comma for the varargs (such as "a,b"), SpEL's ReflectionHelper.convertArguments() method incorrectly converted that single String to an array via the ConversionService, which indirectly converted that String using the StringToArrayConverter, which converts a comma-delimited String to an array. Thus, "a,b" effectively got converted to a two-dimensional array ["a", "b"] instead of simply ["a,b"]. This commit fixes this bug by avoiding use of the TypeConverter and ConversionService for single arguments supplied as varargs when the single argument's type matches the varargs array component type. Closes gh-27582
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