lua/pg: Use fmt for formatting number query parameters #4
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snprintf will format floating point numbers using scientific notation, even if they are representing integers exactly, so when passing a number as a query parameter, postgres would get e.g. "1e+4" and it would complain about this being an invalid parameter for a column of integer type. fmt does the correct thing here and it will format floats representing integers precisely as integers (without period or exponent).