[INTERNAL] 

::

 is_zero(self) -> bool

check if zero (note that false negative answers are possible)

Extra doc: https://github.com/casadi/casadi/wiki/L_qv

Doc source: https://github.com/casadi/casadi/blob/develop/casadi/core/mx.hpp#L344

Implementation: https://github.com/casadi/casadi/blob/develop/casadi/core/mx.cpp#L941-L947

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