Fix undefined behavior #114
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Thanks UBSAN.
Ideally I would benchmark this, because it might be faster to use unaligned addresses if the compiler and the arch supports it.
The largest 64 bit (unsigned) integers cannot be exactly represented as doubles.
So we actually see the errors.
Real limit is platform dependent, so use a conservative value.
For min and max, there is no platform-independent boundary, even though 'double' is supposed to be the same everywhere.
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Thanks UBSAN.