Change the maximum number of collisions detected in a contact

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I am trying to perform some feature extraction with collision data between two object with meshes previously edited in blender to provide many edges. The problem is that I just can get 10 data of contact through: contacts.positionsize() and I need to have more collision points. I am also not clear what this command gives as result: contacts.contactsize(). I will like to get as more contacts as possible for extract the feature in contact and try to run a decent simulation.