fix reported array basicsize
this fixes object size calculation. The previous implementation did not work in cases where the datatype stored in the tinyarray is narrower than a machine word, and the compiler padded 'Array_base' to be word-aligned.
this fixes object size calculation. The previous implementation did not work in cases where the datatype stored in the tinyarray is narrower than a machine word, and the compiler padded 'Array_base' to be word-aligned.