Make `git gc --auto` return immediately and run in background
if the system supports it. Default is true.
+gc.bigPackThreshold::
+ If non-zero, all packs larger than this limit are kept when
+ `git gc` is run. This is very similar to `--keep-base-pack`
+ except that all packs that meet the threshold are kept, not
+ just the base pack. Defaults to zero. Common unit suffixes of
+ 'k', 'm', or 'g' are supported.
++
+Note that if the number of kept packs is more than gc.autoPackLimit,
+this configuration variable is ignored, all packs except the base pack
+will be repacked. After this the number of packs should go below
+gc.autoPackLimit and gc.bigPackThreshold should be respected again.
+
gc.logExpiry::
If the file gc.log exists, then `git gc --auto` won't run
unless that file is more than 'gc.logExpiry' old. Default is