According to answer to my previous question, Tooling API objects are not supported in /composite
calls.
Is there a way to insert a large (let's say 2000) number of ApexClassMembers
instead of iterating through the list and POSTing to /services/data/vXX.X/tooling/sobjects/ApexClassMember/
for every element? Such approach will hit the limits immediately, therefore I consider it useless.