does expose always use threadLocals? i thought that if I pass around a database and always specify the database like

transaction(db) {..}

it will avoid threadlocals, but it seems that all exposed calls inside the transaction still get their transaction from a threadlocal. so it only works if the thread stays the same, and for example it wont work if i have callbacks (or coroutines) that potentielly run in different threads.

I think you're supposed to use

suspendedTransaction { }

when working with coroutines

thanks! my question was more general in regards of explicit dependencies vs implicit dependencies and api design