// keepCoverage to only minimize the crash going forward.
				keepCoverage = nil
			}
			return true
		}
		// Minimization should preserve coverage bits.
		if keepCoverage != nil && isCoverageSubset(keepCoverage, coverageSnapshot) {
			return true
		}
		vals[args.Index] = prev
		return false
	}
	switch v := vals[args.Index].(type) {
	case string: