checks if a function can be called with a set of arguments.
fName is the byte-code style function name (see encodeFunctionName). argTypes is the data types of the arguments
true if it can be called, false if not, or if the fName was incorrect
See Implementation
checks if a function can be called with a set of arguments.
fName is the byte-code style function name (see encodeFunctionName). argTypes is the data types of the arguments