Not if the same ULID generator instance is used across threads.
That depends on if the specific implementation of the generator instance is thread safe. Highly implausible to use the same generator instance between different threads/processes/hosts because there's no benefit at all and only additional downsides.
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That depends on if the specific implementation of the generator instance is thread safe. Highly implausible to use the same generator instance between different threads/processes/hosts because there's no benefit at all and only additional downsides.