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🐛 fix(py-info): detect equivalent base prefixes - #219
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A candidate can report the same base directory with changing path spellings and evade the prefix cycle check. Compare canonical paths while keeping the reported path for interpreter discovery.
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When a queried interpreter reported its base directory with a different
../spelling on each query,resolve_to_system()treated every spelling as a new prefix and kept probing the same candidate. The walk now detects the repeated directory and finishes resolution. Fixes #190.Equivalent prefix spellings
The old cycle check stored the reported prefix string. Python's
realpath()resolves parent segments and links, whilenormcase()folds case and slash spelling on Windows. The new cycle key uses those forms; discovery still receives the reported prefix.Behavior changes
A candidate that reports its own base directory through equivalent paths resolves after one base probe. A cycle through distinct directories still raises
RuntimeError.Reported by Anthropic's OSS Scanner:
ANT-2026-CJZ08KPY.