[issue36287] Make ast.dump() not output optional default fields

[Batuhan Taskaya]

Batuhan Taskaya <batuhanosmantaskaya at gmail.com> added the comment:

> It is not so easy for fields like "type_ignores". They are mutable lists, so this approach cannot be applied to them.

What about keeping ASDL signatures in the nodes (). If we know the type of a field (can be parsed in runtime) we can infer the default value of a field. For type_ignores, it is a sequence so if it is empty we can just crop that part.

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<https://bugs.python.org/issue36287>
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