async-pool

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Thanks for the update! I pulled in 0.3.12 and ran into an issue with the new code:

NoMethodError:
undefined method `zero?' for nil:NilClass

				if usage.zero?
				        ^^^^^^
				        
File /usr/local/bundle/gems/async-pool-0.3.12/lib/async/pool/controller.rb line 213 in reuse
File /usr/local/bundle/gems/async-pool-0.3.12/lib/async/pool/controller.rb line 99 in release
File /usr/local/bundle/gems/neo4j-ruby-driver-4.4.0.alpha.8/ruby/neo4j/driver/internal/handlers/channel_releasing_reset_response_handler.rb line 24 in reset_completed
File /usr/local/bundle/gems/neo4j-ruby-driver-4.4.0.alpha.8/ruby/neo4j/driver/internal/handlers/reset_response_handler.rb line 13 in on_success
File /usr/local/bundle/gems/neo4j-ruby-driver-4.4.0.alpha.8/ruby/neo4j/driver/internal/async/inbound/inbound_message_dispatcher.rb line 39 in handle_success_message
File /usr/local/bundle/gems/neo4j-ruby-driver-4.4.0.alpha.8/ruby/neo4j/driver/internal/messaging/common/common_message_reader.rb line 32 in unpack_success_message
File /usr/local/bundle/gems/neo4j-ruby-driver-4.4.0.alpha.8/ruby/neo4j/driver/internal/messaging/common/common_message_reader.rb line 16 in read
File /usr/local/bundle/gems/neo4j-ruby-driver-4.4.0.alpha.8/ruby/neo4j/driver/internal/async/pool/channel.rb line 53 in ensure_response_handling
File /usr/local/bundle/gems/neo4j-ruby-driver-4.4.0.alpha.8/ruby/neo4j/driver/internal/async/pool/channel.rb line 39 in write_and_flush
File /usr/local/bundle/gems/neo4j-ruby-driver-4.4.0.alpha.8/ruby/neo4j/driver/internal/async/network_connection.rb line 99 in write_reset_message_if_needed
File /usr/local/bundle/gems/neo4j-ruby-driver-4.4.0.alpha.8/ruby/neo4j/driver/internal/async/network_connection.rb line 73 in release
File /usr/local/bundle/gems/neo4j-ruby-driver-4.4.0.alpha.8/ruby/neo4j/driver/internal/async/connection/direct_connection.rb line 7 in release
File /usr/local/bundle/gems/neo4j-ruby-driver-4.4.0.alpha.8/ruby/neo4j/driver/internal/async/unmanaged_transaction.rb line 206 in handle_transaction_completion
File /usr/local/bundle/gems/neo4j-ruby-driver-4.4.0.alpha.8/ruby/neo4j/driver/internal/async/unmanaged_transaction.rb line 98 in block in close_async
File /usr/local/bundle/gems/neo4j-ruby-driver-4.4.0.alpha.8/ruby/neo4j/driver/internal/util/result_holder.rb line 56 in side
File /usr/local/bundle/gems/neo4j-ruby-driver-4.4.0.alpha.8/ruby/neo4j/driver/internal/async/unmanaged_transaction.rb line 98 in close_async
File /usr/local/bundle/gems/neo4j-ruby-driver-4.4.0.alpha.8/ruby/neo4j/driver/internal/async/unmanaged_transaction.rb line 104 in commit_async
File /usr/local/bundle/gems/neo4j-ruby-driver-4.4.0.alpha.8/ruby/neo4j/driver/internal/internal_transaction.rb line 13 in commit
File /usr/local/bundle/gems/neo4j-ruby-driver-4.4.0.alpha.8/lib/neo4j/driver/synchronizable.rb line 16 in block (4 levels) in with_sync_wrapper
File /usr/local/bundle/gems/async-2.0.3/lib/kernel/sync.rb line 36 in Sync
File /usr/local/bundle/gems/neo4j-ruby-driver-4.4.0.alpha.8/lib/neo4j/driver/synchronizable.rb line 16 in block (3 levels) in with_sync_wrapper
File /usr/local/bundle/gems/neo4j-ruby-driver-4.4.0.alpha.8/ruby/neo4j/driver/internal/internal_session.rb line 58 in block in transaction
File /usr/local/bundle/gems/neo4j-ruby-driver-4.4.0.alpha.8/ruby/neo4j/driver/internal/retry/exponential_backoff_retry_logic.rb line 23 in retry
File /usr/local/bundle/gems/neo4j-ruby-driver-4.4.0.alpha.8/ruby/neo4j/driver/internal/internal_session.rb line 55 in transaction
File /usr/local/bundle/gems/neo4j-ruby-driver-4.4.0.alpha.8/lib/neo4j/driver/synchronizable.rb line 16 in block (4 levels) in with_sync_wrapper
File /usr/local/bundle/gems/async-2.0.3/lib/kernel/sync.rb line 36 in Sync
File /usr/local/bundle/gems/neo4j-ruby-driver-4.4.0.alpha.8/lib/neo4j/driver/synchronizable.rb line 16 in block (3 levels) in with_sync_wrapper
File /usr/local/bundle/gems/neo4j-ruby-driver-4.4.0.alpha.8/ruby/neo4j/driver/internal/internal_session.rb line 45 in write_transaction
File /usr/local/bundle/gems/activegraph-11.1.0.alpha.2/lib/active_graph/transactions.rb line 43 in run_transaction_work
File /usr/local/bundle/gems/activegraph-11.1.0.alpha.2/lib/active_graph/transactions.rb line 37 in block in send_transaction
File /usr/local/bundle/gems/neo4j-ruby-driver-4.4.0.alpha.8/lib/neo4j/driver/auto_closable.rb line 19 in block (3 levels) in with_block_definer
File /usr/local/bundle/gems/neo4j-ruby-driver-4.4.0.alpha.8/lib/neo4j/driver/synchronizable.rb line 16 in block (4 levels) in with_sync_wrapper
File /usr/local/bundle/gems/async-2.0.3/lib/async/task.rb line 255 in block in schedule

Originally posted by @danielmconrad in https://github.com/socketry/async-pool/issues/12#issuecomment-1230578491