SafeNumeric TypeDecorator recipe on documentation: wrong semantics

When rounding a Decimal to fit in a database column, the number of digits that must remain following the decimal point should be the scale — please correct me if I am interpreting this incorrectly; I'm using the terminology from MySQL docs. According to this understanding, in the SafeNumeric TypeDecorator recipe in the Custom Types section of the documentation, the values are being rounded using precision - scale digits, which is actually the number of digits before the decimal point. So that should be replaced by just scale.

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