Bug Report: data race in IsFlagProvided function.

[GuptaManan100]

Overview of the Issue

The IsFlagProvided function introduced in #11881 seems to be running into a data race.

The reason is that Visit function is uses isn’t thread-safe -

if len(f.actual) != len(f.sortedActual) {
	f.sortedActual = sortFlags(f.actual)
}
flags = f.sortedActual

So if two go-routines call this same function, one can be reading sortedActual in line 1 and the other could be writing to it in the next line.

Reproduction Steps

Run unit_race over and over until this fails.

Binary Version

main

Operating System and Environment details

main

Log Fragments

No response