Consistent SI-prefix for small numbers.
For reasons that I can’t recall, the SI-prefix behavior was different for small numbers (between -1 and 1) than it was for large numbers. This commit enforces consistent behavior, so that the coefficient is always in the range [1, 1000), like in engineering notation. For example, the old d3.format("s") would display 0.01 as "0.01", whereas the new behavior displays it as "10m".
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