[INTERNAL] 

::

 is_constant(self) -> bool

Check if the matrix is constant (note that false negative answers are possible)

Extra doc: https://github.com/casadi/casadi/wiki/L_19v

Doc source: https://github.com/casadi/casadi/blob/develop/casadi/core/matrix_decl.hpp#L1085

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