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Worst-case behaviour of hash collision with float NaN #87641

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rhettinger
Labels
3.10only security fixes3.11only security fixesinterpreter-core(Objects, Python, Grammar, and Parser dirs)performancePerformance or resource usagestdlibStandard Library Python modules in the Lib/ directory
@congma

Description

@congma
mannequin
BPO43475
Nosy@tim-one,@rhettinger,@mdickinson,@serhiy-storchaka,@miss-islington,@congma
PRs
  • bpo-43475: Fix worst case collision behavior for NaN instances #25493
  • bpo-43475: Fix the Python implementation of hash of Decimal NaN #26679
  • [3.10] bpo-43475: Fix the Python implementation of hash of Decimal NaN (GH-26679) #26706
  • bpo-43475: Add what's new entry for NaN hash changes #26725
  • [3.10] bpo-43475: Add what's new entry for NaN hash changes (GH-26725) #26743
  • Files
  • nan_key.py: PoC for NaN-collisions and possible fix for worst-case
  • Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

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    GitHub fields:

    assignee='https://github.com/rhettinger'closed_at=<Date2021-06-16.11:36:54.791>created_at=<Date2021-03-11.14:55:33.263>labels= ['interpreter-core','3.11','library','3.10','performance']title='Worst-case behaviour of hash collision with float NaN'updated_at=<Date2021-11-24.13:46:50.396>user='https://github.com/congma'

    bugs.python.org fields:

    activity=<Date2021-11-24.13:46:50.396>actor='cwg'assignee='rhettinger'closed=Trueclosed_date=<Date2021-06-16.11:36:54.791>closer='mark.dickinson'components= ['Interpreter Core','Library (Lib)']creation=<Date2021-03-11.14:55:33.263>creator='congma'dependencies= []files= ['49869']hgrepos= []issue_num=43475keywords= ['patch']message_count=40.0messages= ['388508','388511','388512','388513','388514','388519','388522','388579','388603','388604','388605','388608','388702','388717','388748','390698','390701','390767','390770','391605','391606','391607','395643','395653','395685','395745','395746','395748','395749','395750','395761','395773','395783','395892','395894','395918','406917','406925','406927','406928']nosy_count=8.0nosy_names= ['tim.peters','rhettinger','mark.dickinson','serhiy.storchaka','miss-islington','cwg','realead','congma']pr_nums= ['25493','26679','26706','26725','26743']priority='normal'resolution='fixed'stage='resolved'status='closed'superseder=Nonetype='performance'url='https://bugs.python.org/issue43475'versions= ['Python 3.10','Python 3.11']

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    3.10only security fixes3.11only security fixesinterpreter-core(Objects, Python, Grammar, and Parser dirs)performancePerformance or resource usagestdlibStandard Library Python modules in the Lib/ directory

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