Issue #2952 has been updated by Russell Penney.


Thank you, that makes a lot of sense. I obviously had been looking at values that don't suffer from the Float precision (or round up to the same value) which is why I got confused with Float#to_s printing the same value.
I looked more closely at Time#at in the documents and saw it expects microseconds as you say, my bad.
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http://redmine.ruby-lang.org/issues/show/2952

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