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GRF integer parameters can be given negative values. #57
When giving a grf parameter a negative value, the compiler doesn't complain. Though OpenTTD has an assertion check to see if the values of the dropdown are positive.
A zip containing the .grf and the .nml file.
Not sure, but maybe this is a OpenTTD related issue. This issue exists in various versions of OpenTTD, aswell as in JGR.