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Previous versions of JScript provided an arguments object inside function definitions, which allowed functions to accept an arbitrary number of arguments. The arguments object also provided a reference to the current function as well as the calling function.
In fast mode, the arguments object is not available. However, JScript .NET allows function declarations to specify a parameter array in the function parameter list. This allows the function to accept an arbitrary number of arguments, thus replacing part of the functionality of the arguments object.
Note: It is not possible to directly access and reference the current function or calling function in fast mode.