Results of the comparison of is_read with isReadable

is_read took 91.4 ms and isReadable took 570.8 ms

The difference between the largest (isReadable) and the smallest (is_read) was 479.4 ms or 84 %

There were 3 runs with 5000 iterations of each function, a total of 30000 executions
All figures quoted to 1 decimal places and in ms