MII number calculation gives -0

SAP MII Version: 15.2 SP3 Patch 8 (Mar 20, 2019)

Scenario: I'm retrieving 2 values do a calculation and if the calculation is negative throw an error.

Issue: for certain values the calculation returns '-0' and handles it as a negative number. As I'm retrieving my values from a custom SQL action block the values are text.

Expected behaviour: the first expression should return '0'. The second expression should return '0' or 'false'

Did somebody else experience this behaviour? Does someone know if this is fixed in later patched?