[inopinatus]

Sadly they wrap around in 133 years. Maybe Segment don't plan on still existing in 2153? Also, base62 really should give way to base58 for any identifier that an ops person might have to type in a hurry.

Thus the quest for the perfect identifier continues.

NB: generating many unique IDs per millisecond for a long period may be a hallmark of a large distributed system, but even a small application may want this for a brief time e.g. importing bulk customer data.