Function rangeStream

Keeps track of min/max values.

const s = rangeStream();
s.seen(10);  // { min: 10, max: 10 }
s.seen(5);   // { min: 5,  max: 10 }
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When calling seen(), non-numbers, or non-finite numbers are silently ignored.

s.reset();   // Reset
s.min/s.max; // Current min/max
s.range;     // Current { min, max }
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