keras/src/layers/convolutional/base_conv.py/BaseConv/save_own_variables
class BaseConv:    def save_own_variables(self, store):
        # Do nothing if the layer isn't yet built
        if not self.built:
            return
        target_variables = [self.kernel]
        if self.use_bias:
            target_variables.append(self.bias)
        for i, variable in enumerate(target_variables):
            store[str(i)] = variable