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(task 432)
The exitHandlers map keyed by reflect.Type was a reflection-based dispatch
table that incurred allocation and reflection overhead on every event pair
in the hot processing path. Replace it with a plain type switch in
handleTracepointExit, which the compiler resolves statically.
Removes: initExitHandlers, typeKey, mustBeType, newTypedExitHandler,
exitHandlerRegistry, the exitHandlers struct field, and the tracepointExitHandler
type alias — all dead after the switch. Fixes a pre-existing uint→uint64
mismatch in stats(). Updates tests to target the new default branch directly.
Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>
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