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Suspicious:
bool(0.0)
is false, so if the current value of the parameter is 0 then this code wasn't updating it.I didn't look at the context, but this change may fix other bugs.
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There are a number of issues when params become 0. We should also test to see if this solves #3053
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Out of curiosity, I decided to test and, unless I am mistaking the issue, this should now fix #3053.