mekso unary operator: converts a string of digits which includes {pi} to the same string of digits without {pi}; if {pi} is not present in the original/input string, the output is identical
Probably can be generalized to handle pi'e and distinguish macro- from micro-digits. Notice that it produces a string of digits; the meaning of this string must be established by processing through JUhU or the like. The input must also be a string of digits (not a number). Useful for certain algorithms, such as an nth root algorithm.