"""Casts each element of an iterable to a specified type and optionally returns the result in a specified type.

This function takes an iterable and casts each of its elements to the type specified by `dst_type`. The result is returned as an iterable of the cast elements. Optionally, the result can be converted to a specified return type using the `return_type` parameter.

Args:
    inputs (Iterable): The iterable whose elements are to be cast. Must be an iterable object.
    dst_type (Type): The type to which each element of the iterable will be cast. Must be a valid type.
    return_type (Optional[Type]): The type to which the resulting iterable will be converted. If None, the result is returned as an iterable.

Returns:
    Iterable: An iterable of elements cast to `dst_type`. If `return_type` is specified, the result is converted to that type.

Raises:
    TypeError: If `inputs` is not an iterable or if `dst_type` is not a valid type.
"""