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Decide on a consistent mean fixing logic for the emissivity fields

context: C backendChanges occur predominantly in the C codeChanges occur predominantly in the C code

priority: mediumMedium priorityMedium priority

status: requires discussionIssue requires further discussion before implementationIssue requires further discussion before implementation

type: accuracyEnhancement that improves accuracyEnhancement that improves accuracy

Status: Open.

#669 In 21cmfast/21cmFAST;

· jordanflitter opened on Apr 14, 2026

Filter emissivity fields in all SOURCE_MODEL options

context: C backendChanges occur predominantly in the C codeChanges occur predominantly in the C code

effort: highIssues that will probably require >1 full day of coding to implementIssues that will probably require >1 full day of coding to implement

priority: highHigh priorityHigh priority

type: accuracyEnhancement that improves accuracyEnhancement that improves accuracy

type: maint: refactoringRefactoringRefactoring

type: maint: removalRemovals and DeprecationsRemovals and Deprecations

Status: Open.

#668 In 21cmfast/21cmFAST;

· jordanflitter opened on Apr 14, 2026

Small redshift step size [BUG]

priority: highHigh priorityHigh priority

type: bugSomething isn't workingSomething isn't working

Status: Open.

#667 In 21cmfast/21cmFAST;

· coltonf96 opened on Apr 13, 2026

Raise an error if lightconer.cosmo != inputs.cosmo_params.cosmo

context: error-handlingChanges predominantly affect error handlingChanges predominantly affect error handling

context: python wrapperChanges predominantly concerning the python wrapperChanges predominantly concerning the python wrapper

effort: lowIssues that will require less than a day of coding to implementIssues that will require less than a day of coding to implement

priority: highHigh priorityHigh priority

Status: Open.

#666 In 21cmfast/21cmFAST;

· Klarajons1228 opened on Apr 9, 2026

Think about the file layout before the release of v5

context: C backendChanges occur predominantly in the C codeChanges occur predominantly in the C code

priority: lowLow priorityLow priority

status: requires discussionIssue requires further discussion before implementationIssue requires further discussion before implementation

type: maint: refactoringRefactoringRefactoring

Status: Open.

#665 In 21cmfast/21cmFAST;

· jordanflitter opened on Apr 7, 2026

Usage of ZPRIME_STEP_FACTOR and Z_HEAT_MAX in the C code

context: C backendChanges occur predominantly in the C codeChanges occur predominantly in the C code

priority: mediumMedium priorityMedium priority

type: maint: removalRemovals and DeprecationsRemovals and Deprecations

Status: Open.

#664 In 21cmfast/21cmFAST;

· jordanflitter opened on Apr 7, 2026

CosmoTables should be a cached_property on InputParameters

priority: mediumMedium priorityMedium priority

type: performance: speedPerformance improvements that reduce walltimePerformance improvements that reduce walltime

Status: Open.

#663 In 21cmfast/21cmFAST;

· steven-murray opened on Apr 7, 2026

Improve runtime performance in tau_X, mostly before reionization has started

context: C backendChanges occur predominantly in the C codeChanges occur predominantly in the C code

priority: mediumMedium priorityMedium priority

status: requires researchIssue requires further research before implementationIssue requires further research before implementation

type: performance: speedPerformance improvements that reduce walltimePerformance improvements that reduce walltime

Status: Open.

#660 In 21cmfast/21cmFAST;

· jordanflitter opened on Apr 2, 2026

Improve precision of tau_X, mostly after reionization has started

context: C backendChanges occur predominantly in the C codeChanges occur predominantly in the C code

priority: mediumMedium priorityMedium priority

type: accuracyEnhancement that improves accuracyEnhancement that improves accuracy

Status: Open.

#659 In 21cmfast/21cmFAST;

· jordanflitter opened on Apr 2, 2026

Better logic for volume filling factor in tau_X

context: C backendChanges occur predominantly in the C codeChanges occur predominantly in the C code

priority: mediumMedium priorityMedium priority

status: requires researchIssue requires further research before implementationIssue requires further research before implementation

type: accuracyEnhancement that improves accuracyEnhancement that improves accuracy

type: performance: speedPerformance improvements that reduce walltimePerformance improvements that reduce walltime

Status: Open.

#658 In 21cmfast/21cmFAST;

· jordanflitter opened on Apr 2, 2026

Get halo mass functions from the hmf package

API BreakingBreaking ChangesBreaking Changes

context: C backendChanges occur predominantly in the C codeChanges occur predominantly in the C code

context: python wrapperChanges predominantly concerning the python wrapperChanges predominantly concerning the python wrapper

effort: highIssues that will probably require >1 full day of coding to implementIssues that will probably require >1 full day of coding to implement

priority: mediumMedium priorityMedium priority

status: requires discussionIssue requires further discussion before implementationIssue requires further discussion before implementation

Status: Open.

#657 In 21cmfast/21cmFAST;

· jordanflitter opened on Apr 2, 2026

Bugs in perturb_halo_catalog

context: python wrapperChanges predominantly concerning the python wrapperChanges predominantly concerning the python wrapper

priority: highHigh priorityHigh priority

type: bugSomething isn't workingSomething isn't working

Status: Open.

Bug

#647 In 21cmfast/21cmFAST;

· jordanflitter opened on Mar 17, 2026