Return a new object with squeezed data.
dim : None or str or tuple of str, optional
Selects a subset of the length one dimensions. If a dimension is selected with length greater than one, an error is raised. If None, all length one dimensions are squeezed.
drop : bool, optional
drop=True, drop squeezed coordinates instead of making them scalar.
squeezed : same type as caller
This object, but with with all or a subset of the dimensions of length 1 removed.