Okay, fair enough. But i128 is still plenty for femtoseconds.
Keep in mind that going from 64 to 128 bits squares the available range. The number of femtoseconds is merely a million times the number of nanoseconds, whereas the number of numbers representable by an i128 is 2^64 times the number representable by an i64.
Keep in mind that going from 64 to 128 bits squares the available range. The number of femtoseconds is merely a million times the number of nanoseconds, whereas the number of numbers representable by an i128 is 2^64 times the number representable by an i64.