Ulid().toMillis() Wrong in javascript environment.

[rayk]

• This problem has not been seen when the code is run on the VM.
• compile with Dart2js, even with no optimizations and the .toMillis() start to play up.

The simplest example is probably;

actual correct epoch time was: 1547440090230

Ulid().toMills()

• run this in the vm and one gets: 1547440090230
• run when compiled to JS and get: 1251924761

The above is consistently repeated in different environments.