[migration] fix handling of default value for boolean attributes We can't assert that the old value is 'True' or 'False', because False used to be stored as an empty string in pre-3.18 versions.

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Data model

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==========

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This chapter describes how you define a schema and how to make it evolves as the time goes.

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.. toctree::

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   :maxdepth: 1

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   definition

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   metadata

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   baseschema

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   define-workflows