Fix Base.hash to use only the two-arg method#602
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stevengj merged 1 commit intoJuliaPy:masterfrom Mar 19, 2026
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Generated as part of an ecosystem-wide audit for one-arg hash methods. `Base.hash` should only be extended via the two-arg method `hash(x, h::UInt)`. Defining a one-arg `hash(x)` method, or giving the second argument a default value, can lead to correctness bugs (hash contract violations when the seed differs from the hard-coded default) and invalidation-related performance issues. This is particularly necessary for Julia 1.13+ where the default hash seed value will change. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Additional details and impacted files@@ Coverage Diff @@
## master #602 +/- ##
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- Coverage 22.31% 22.09% -0.22%
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Files 4 4
Lines 363 362 -1
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- Hits 81 80 -1
Misses 282 282 ☔ View full report in Codecov by Sentry. 🚀 New features to boost your workflow:
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Generated as part of an ecosystem-wide audit for one-arg hash methods.
Base.hashshould only be extended via the two-arg methodhash(x, h::UInt).Defining a one-arg
hash(x)method, or giving the second argument a defaultvalue, can lead to correctness bugs (hash contract violations when the seed
differs from the hard-coded default) and invalidation-related performance
issues. This is particularly necessary for Julia 1.13+ where the default hash
seed value will change.
This PR was generated with the assistance of generative AI.