Transactions do not accept JSON objects

[kostasb]

Describe the bug

• Reproduced with client version: 0.29.5

The transactions endpoint does not support objects. The object must be stringified to work in a transaction.
For reference, record create calls support objects directly.

SDK example:

const myblob = { test: "a" };
await xata.transactions.run([
  { insert: { table: "test", record: { json_column: myblob } } },
]);

Payload:

{"operations":[{"insert":{"table":"test","record":{"json_column":{"test":"a"}}}}]}

Response 400:

{"errors":[{"index":0,"message":"table [trs]: invalid record: column [json_column]: type mismatch: expected string"}],"id":"a458f426-9f63-90ca-b64e-b30b3f633c40"}

For the operation to succeed with the current state of things, the object must be stringified:

await xata.transactions.run([
  { insert: { table: "test", record: { json_column: JSON.stringify(myblob) } } },
]);