Sparkline in unicode: Difference between revisions

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To vary the approach, the block used is derived from the option type (<code>Just x | Nothing</code>) result of a search over 7 zero-indexed lower bounds [0..6].
 
If a lower bound whose value exceeds that of the given data point iscan be found, we just use the index of that bound.
 
If the search result is 'not found' (Nothing), then we use the highest (nominally 8th) block.
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