 One more limitation to observe about Lewis’ Dutch Strategy argument for changing credences by Conditionalization stems from his formulation of the principle itself in terms of the ratio formula, which requires that the prior probability of the evidence conditionalized on is non-zero.  Rescorla (2019) addresses this by giving a form of conditionalization, which he terms Kolmogorov Conditionalization, that permits conditionalizing on evidence with null priors. He then proves a Dutch Book theorem and converse for it, where the theorems involve generalized learning scenarios.  