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https://github.com/silverstripe/silverstripe-mathspamprotection
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ce700643f5
problem: loose comparison with == -> Null = "0" solved: strict comparison with === -> Null = false new session with $v1 = 0 and $v2 = 0 did lead to true answer with actually no answer given (Null -> "0") 0 + 0 = 0 -> true ref: https://www.php.net/manual/en/types.comparisons.php