Change Artifact.equals() to early-out if hashcodes differ. java.util.HashMap.get() has an optimization where it compares the hashcode to a cached value before calling equals() on the candidate key. CompactHashSet/Map keep a table of cached hashcodes. But RegularImmutableMap only has a comment saying it assumes the objects in the collection will optimize equals() with == and hashcode as appropriate! Simplify use of Objects.equal(); none of the fields are nullable. Take getClass() out of hashcode computation. I think two different Artifact subclasses for the same path is unusual in normal operation, and I may try to exploit the pass-through hashcode in ActionInputMap. RELNOTES: None. PiperOrigin-RevId: 210117899
{Fast, Correct} - Choose two
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