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the erlang documentation says:
erlang:now()
[…] It is also guaranteed that subsequent calls to this BIF returns continuously increasing values. Hence, the return value from now() can be used to generate unique time-stamps, and if it is called in a tight loop on a fast machine the time of the node can become skewed. […]
I find this a little strange (especially considering that the granularity is microsecond). Why was it specced this way?
Because it can then be used to uniquely generate timestamp numbers. The
osmodule has a variant which does not do that.