For the posted script, I get the output 
$VAR1 = [
          [
            '0.0149999999994179'
          ],
          [
            '0'
          ]
        ];

[download]
ActiveState v5.14.3 on Win7, DBD::SQLite 1.37. Also passed with ActiveState v5.16.2, DBD::SQLite 1.37. Confirmed failure for Linux, v5.10.1 with 1.27 and v5.14.2 with 1.35.

Maybe this is a bug that got fixed in the DBD between 1.35 and 1.37?

#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.

In reply to Re: SQLite and Custom Aggregates by kennethk
in thread SQLite and Custom Aggregates by Anonymous Monk

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