REF: move attribute setting towards the constructor #29979
Merged
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The end goal is to minimize the amount of attribute setting that is done outside of the constructor (or create_for_block which is a classmethod and ill give it a pass).
create_for_block is called in one place, and immediately after that set_atom is called on the result. set_atom does a ton of attribute setting, so the idea here is to gradually move that attribute setting up into create_for_block.
Related but kept for a separate branch, most of the affected methods have
block
arguments, these can all be changed to operate on block.values, which will narrow the exposure to internals.