[INTERNAL] 

::

 nu(self) -> int

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Extra doc: https://github.com/casadi/casadi/wiki/L_69

Doc source: https://github.com/casadi/casadi/blob/develop/casadi/core/dae_builder.hpp#L256

Implementation: https://github.com/casadi/casadi/blob/develop/casadi/core/dae_builder.cpp#L202-L204

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