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The setting for garbagecollector was added 7 years ago in9ac91e5172
for "debugging gc". graph_builder was added 6 years ina98801c1
when restoring the -vmodule parameter after some temporary removal, without an explanation. It seems safe to assume that the garbage collector has been debugged sufficiently... These defaults cause performance overhead: - Enabling -vmodule slows down all log calls because checking verbosity cannot take a simpler fast path. - The amount of log output is much higher for those files. The amount of log data also caused test output to get truncated, removing the actual test failure explanation.