I have an VO[] that gets persisted to postgres.

@Column(ColumnTypes.JSON, {nullable: true})
weights: VO[];

The field value in the database is:
[{"documentId":140,"topicId":24,"weight":0.25},{"documentId":140,"topicId":24,"weight":0.25},{"documentId":140,"topicId":26,"weight":0.25},{"documentId":140,"topicId":27,"weight":0.25}]

When i try and read that out of the database, it calls:
PostgresDriver.ts => prepareHydratedValue

and calls JSON.parse(value)

This results in:
Unexpected token o in JSON at position 1
Why is the field value in the database not stringified?