Problems getting batching to work

[Szeliga]

Consider the following scenario:

• API A returns resource A
• API B returns resource B
• resource A can have one resource B (but doesn't have to)
• I return 10 resources A
• Only the first resource A has a resource B

When I combine the 2 sources normally, I get the expected result, but suffer from N+1.

However, when adding batching, it assigns that one resource B to all resources A in the response. Is the matching based on the size and order of the response array? The documentation doesn't mention anything about the assumptions this solution takes.