[RUNTIME][FFI][BUGFIX] Fix cython FFI compact with np.int64 #6321
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tqchen
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junrushao
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This is a really interesting finding! Thanks @mbrookhart @tqchen!
ZihengJiang
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Previously np.int64 was not subclass of int, long, but get categorized as a subclass of Number.
The too big value get converted to a double, which causes underflow when converting back to integer.