Question. How accurate are vex iq sensor readings?

Hi, I have a question about the levels of accuracy of vex iq parts and sensors.
Sprcificially, I have questions about what level of accuracy is a timer started on the vex brain (0.000…1 of a second) and what level of accuracy is a vex iq gyro (0.00…1 of a degree).
I also have another question about whether it is possible to change variables in vexcode iq blocks from floats to bools.