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```
$hash{ sprintf '%.6e', $number };
```

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printf "%20s becomes %.6e\n", $_, $_ for map{ 
    ( $_, ( $_ + 1e-10 ) ) 
...
              2e+030 becomes 2.00000000000e+030
               2e300 becomes 2.00000000000e+300
              2e+300 becomes 2.00000000000e+300