Use ObjectSpace::WeakKeyMap for level_override #136
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This allows fiber keys to be GCed and removed from the map. Otherwise, fibers that call `#with_level` create a memory leak if they are killed without running their ensure blocks.
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This was referenced Oct 1, 2025
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This allows fiber keys to be GCed and removed from the map. Otherwise, fibers that call
#with_levelcreate a memory leak if they are abandoned without running their ensure blocks.Please note that
Thread#killis not the only way for a Fiber to be abandoned without running its ensure block. It's as simple asto_enum(:method_that_calls_with_level).next.This is related to @byroot's comment here: #132 (comment)