Design question: prefer methods or util functions?

[clinssen]

This a software patterns/design question that affects mostly the ASTNode class hierarchy.

Do we prefer ASTNode mehods, e.g. neuron.add_to_internal_block(foo) or do we prefer a package of helper functions, e.g. ast_utils.add_to_internal_block(neuron, foo)?

Note that the ASTNode class hierarchy is not currently being generated by Antlr, but this could hypothetically change in the (far) future.

[Silmathoron]

I think the ast_utils module may slightly facilitate readability for future developers, rather than having a huge ASTNode class, but I am not sure the stakes are very high