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c8b6594305
Subquery deconstruction support required implementing complex and expensive equality rules for sql.Query objects for little benefit as the latter cannot themselves be made deconstructible to their reference to model classes. Making Expression @deconstructible and not BaseExpression allows interested parties to conform to the "expression" API even if they are not deconstructible as it's only a requirement for expressions allowed in Model fields and meta options (e.g. constraints, indexes). Thanks Phillip Cutter for the report. This also fixes a performance regression in bbf141bcdc31f1324048af9233583a523ac54c94.
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