Comment 5 for bug 1568195

So, there's probably a sweet spot between reducing the number of times that a stored procedure is invoked and reducing the size of strings that Pg has to parse when invoking the stored procedure, but it seems clear that for our purposes, using a TEXT[] is fast enough -- and it also means that we won't be subject to packagers setting low values for FUNC_MAX_ARGS, nor would we have to check the value max_function_args. Consequently, I'll work up a patch that uses TEXT[].