fix: Optional[None] used as default value in tracer + max_separation - #675
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Optional[None] evaluates to NoneType, a truthy class object, so these defaults silently passed `is not None` guards: the tracer's early-exit block ran on every default call (comparing plane_index == NoneType, always False) and SourceMaxSeparation's default only worked because np.isclose(NoneType, z) raises the TypeError the except clause catches. A real None preserves behavior at all three sites. Closes #674 Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Summary
Fixes three sites that used the typing construct
Optional[None]as a default value (it evaluates toNoneType, a truthy class object that passesis not Noneguards):autolens/lens/tracer.py—traced_grid_2d_list_from(..., plane_index_limit: Optional[int] = None)autolens/lens/tracer_util.py— same signature fix in the module-level functionautolens/point/max_separation.py—SourceMaxSeparation(..., plane_redshift: Optional[float] = None)Behavior is preserved at all three sites (verified by reading the callees): the tracer's early-exit guard previously ran on every default call but compared
plane_index == NoneType(always False), andSourceMaxSeparation's default only worked becausenp.isclose(NoneType, z)raises the sameTypeErrorthatnp.isclose(None, z)does, hitting the existingexcept TypeErrorfallback toplane_index = -1.Sweep of PyAutoGalaxy, PyAutoArray and PyAutoFit found no further sites. Found while re-syncing the pedagogical code copies in autolens_workspace#413 (issue #674).
Test Plan
python -m pytest test_autolens/lens/ test_autolens/point/— 200 passed🤖 Generated with Claude Code