cast to number before summing values #284
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Loading data from CSV files can result in fields intended for quantitative use coming in as strings. Casting prevents them from being concatenated instead of summed.
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Cast to numbers before summing to ensure that
+always means addition and does not mean concatenation.This is similar to the change in pull request #283, but the same mechanism is required in both places because some chart types may never hit the code path to apply the earlier upstream version of the fix.