This is a command-line tool for general-purpose bisection search. Given a pair
of integer values (typically changelist numbers) that bracket a change in
status from working (GOOD) to non-working (BAD) or vice versa, this tool does a
binary search by invoking the specified script for each probe value.
If the script succeeds, the probe is considered GOOD; otherwise BAD. Search
continues until adjacent values are found that bracket the GOOD/BAD divide.
Here is a trivial example, just to illustrate usage: