Allow instance_variable_get for gems than need low level acces #138
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example, `Rails` uses `instance_variable_get` to get access to the underlying Pg gem adapter object, to do some low level manipulation: cf. https://github.com/rails/rails/blob/aa1bee96f565b2f894e4b9eef434990ecfaaa833/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb#L340
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example,
Railsusesinstance_variable_getto get access to the underlying Pg gem adapter object, to do some low level manipulation: cf. https://github.com/rails/rails/blob/aa1bee96f565b2f894e4b9eef434990ecfaaa833/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb#L340in batch calls such as
destroy_allorupdate_all, the entire transaction sometimes gets rolled back, or sometimes we get this weird behavior where out of 5000 rows, 2 get deleted, but not the remaining 4998