Billy Chan 83c6e4a4db
RelationDef & RelationBuilder are Send & Sync (#898)
* `RelationDef` & `RelationBuilder` are `Send` & `Sync`

* [issues] add tests

Co-authored-by: Chris Tsang <chris.2y3@outlook.com>
2022-07-21 23:35:20 +08:00
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