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

[Ivan Levkivskyi]

Ivan Levkivskyi <levkivskyi at gmail.com> added the comment:

We can probably also skip `type_ignores` list if it is empty (which will be the case in 99% situations).

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nosy: +levkivskyi

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36287>
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