concurrent map writes happened while use "options.WithGenerateUniqueValues(true)"

[Milk-Tang]

while I'm using faker.Username(options.WithGenerateUniqueValues(true)) in a concurrent scenario，
"concurrent map writes" happened in the func generateUnique：

faker/faker.go

Lines 1328 to 1337 in 91fd09b

	func generateUnique(dataType string, fn func() interface{}) (interface{}, error) {
	for i := 0; i < maxRetry; i++ {
	value := fn()
	if !slice.ContainsValue(uniqueValues[dataType], value) { // Retry if unique value already found
	uniqueValues[dataType] = append(uniqueValues[dataType], value)
	return value, nil
	}
	}
	return reflect.Value{}, fmt.Errorf(fakerErrors.ErrUniqueFailure, dataType)
	}

[bxcodec]

Can you give me your test scenario? How to reproduce it here? What are the usecases?

[bxcodec]

uniqueValues[dataType] = append(uniqueValues[dataType], value) 

This line definitely not safe for concurrent

[Milk-Tang]

Can you give me your test scenario? How to reproduce it here? What are the usecases?

Simply put, I used the faker. Username (options. WithGenerateUniqueValues (true)) method in concurrent use cases