A timespan is internally represented entirely in arbitrary base units, currently defined as milliseconds. A timespan is a pair of values, one defining the bottom end of the interval, the other the top end. The bottom interval is always closed, the top end is always open: [bottom, top).
Timespans may be absolute, or relative to the current time.
Relative timespans have values for 'lo' and 'hi' given in seconds relative to "now." Absolute timespans have values for 'lo' and 'hi' relative to the Unix Epoch.
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