glMaterial with GL_COLOR_INDEXES

Hi, I have a question related to the function glMaterial when one gives it the parameter GL_COLOR_INDEXES. I have right understood that we can use glMaterialfv ou glMaterialiv to provide 3 floats or 3 ints, but what I would like to know is if internally the parameters for GL_COLOR_INDEXES are 3 ints or 3 floats ? thanks

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