Fix TypeScript definitions for concat and merge method #85
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Variadic arguments are represented as an array of arguments, so if the argument types are arrays, they must be defined as an array of arrays.
This wrong definition allows to pass objects that are not arrays as arguments. It won't cause a run-time error, but the return value won't match the defined type.
In addition, if the definition is divided for each type, it is not possible to mix arrays and IEnumerable types as arguments.
Therefore, it should be defined as a union type.