assignee=Noneclosed_at=Nonecreated_at=<Date2021-07-23.10:18:59.285>labels= ['type-bug','3.9','expert-unicode']title='Codec name normalization breaks custom codecs'updated_at=<Date2022-01-25.02:02:30.022>user='https://github.com/bodograumann'

activity=<Date2022-01-25.02:02:30.022>actor='methane'assignee='none'closed=Falseclosed_date=Nonecloser=Nonecomponents= ['Unicode']creation=<Date2021-07-23.10:18:59.285>creator='bodograumann'dependencies= []files= []hgrepos= []issue_num=44723keywords= []message_count=1.0messages= ['398042']nosy_count=5.0nosy_names= ['gregory.p.smith','vstinner','ezio.melotti','methane','bodograumann']pr_nums= []priority='normal'resolution=Nonestage=Nonestatus='open'superseder=Nonetype='behavior'url='https://bugs.python.org/issue44723'versions= ['Python 3.9']