Commits on Aug 15, 2023

1. Support custom builtin_types in to_builtins …

   This adds support for "custom" `builtin_types` in `to_builtins`. This is
   useful when wrapping a protocol like `bson` that has protocol specific
   types like `ObjectId` that you'll want to pass through unchanged.
   
   For example, to support passing `bson.ObjectId` through
   `msgspec.to_builtins`:
   
   ```python
   In [1]: import msgspec, bson
   
   In [2]: class Point(msgspec.Struct):
      ...:     _id: bson.ObjectId
      ...:     x: int
      ...:     y: int
      ...:
   
   In [3]: obj = Point(bson.ObjectId(), 1, 2)
   
   In [4]: obj
   Out[4]: Point(_id=ObjectId('64dad4a21ffe3dbdae50a48e'), x=1, y=2)
   
   In [5]: msg = msgspec.to_builtins(obj, builtin_types=(bson.ObjectId,))
   
   In [6]: msg
   Out[6]: {'_id': ObjectId('64dad4a21ffe3dbdae50a48e'), 'x': 1, 'y': 2}
   
   In [7]: msgspec.convert(msg, type=Point)
   Out[7]: Point(_id=ObjectId('64dad4a21ffe3dbdae50a48e'), x=1, y=2)
   ```

   

   jcrist committed Aug 15, 2023
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