* feat: better repr for WeakCallback objects
* refactor: make EmitLoop error message clearer
* perf: don't compare before/after values in evented
dataclass/model when no signals connected
* fix: emission of events from root validators and extraneous
emission of dependent fields
OBS-URL: https://build.opensuse.org/package/show/devel:languages:python/python-psygnal?expand=0&rev=3