* fix 30 - work around delayed registration triggering failures
0.9.0
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* drop dectate, registration is implemented locally again * fix 18: error out when incorrectly registering contextual properties * add generics to contextual property
* update to setup.cfg metadata and modernize build * drop python <3.6 support * update pre-commiting * drop the long deprecated reigster_external_implementations helper * drop unnneeded reg/importscan requirements * upgrade attrs to 20.x