sphinx coreseek SetSortMode(SPH_SORT_ATTR_ASC, '') 对float 排序设置bug

when I use SetSortMode(SPH_SORT_ATTR_ASC, 'floatVar'), it works unexpectedly. for example, I have a float Var ranging from [-10.0, 10.0] when I SetSortMode(SPH_SORT_ATTR_ASC, 'floatVar', the result is

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