Mixed content tail is added twice

[tefra]

This is a complex case but the new serialize writers brought this to my attention

@dataclass
class A:

    any_element: Optional[object] = field(
        default=None,
        metadata=dict(
            type="Wildcard",
            namespace="##any",
            required=True
        )
    )


@dataclass
class Root:
    class Meta:
        name = "root"
        namespace = "foo"

    mixed: List["Root.Mixed"] = field(
        default_factory=list,
        metadata=dict(
            type="Element",
            min_occurs=0,
            max_occurs=9223372036854775807
        )
    )

    @dataclass
    class Mixed:
        content: List[object] = field(
            default_factory=list,
            metadata=dict(
                type="Wildcard",
                namespace="##any",
                mixed=True,
                min_occurs=0,
                max_occurs=9223372036854775807
            )
        )
        a: List[A] = field(
            default_factory=list,
            metadata=dict(
                type="Element",
                min_occurs=0,
                max_occurs=9223372036854775807
            )
        )

<root xmlns="foo">
	<mixed>
		<a /> mi
	</mixed>
</root>

Root(
    mixed=[
        Root.Mixed(content=[
            A(any_element=AnyElement(qname=None, text=None, tail=' mi ', s_map={None: 'foo'})),
            ' mi ',
        ])
    ]
)

The binding node, allows the tail to be added to both the generic object and to the content list. I feel sorry for anyone working with schemas like this but yeah.