Merge the `others` schema into this instance.

        The values will all be read from the provider of the original object.

def merge(cls, *others):
        """
        Merge the `others` schema into this instance.

        The values will all be read from the provider of the original object.
        """
        for other in others:
            for k, v in other:
                setattr(cls, k, BoundValue(cls, k, v.value))