Why are Instance methods not instrumented

[Jarvx]

atheris/src/instrument_bytecode.py

Line 1196 in 33a1322

# Bound methods can't be instrumented - instrument the real func instead

I have such observation that code instrumentation does not apply to instance methods. I wonder if this is a TODO of this project or there are some reasons that such functions should not be instrumented. I am trying to learn testing program and this project. Many thanks for any explainations.