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e4fc0d4b3f
When we're extracting a gem, it should be extracted to an empty
directory. Trying to remove every file before extracting the file
greatly slows the tar extraction process.
This change increases tar extraction speed by about 10%:
Master branch:
```
aaron@tc ~/g/tartest (main)> ruby -I../rubygems/lib:../vernier/lib test.rb
{MEAN: 0.https://github.com/rubygems/rubygems/commit/670195550005}
{stddev: 0.https://github.com/rubygems/rubygems/commit/029875687861}
{"mib/s": 20.https://github.com/rubygems/rubygems/commit/889425481677}
```
This commit:
```
aaron@tc ~/g/tartest (main)> ruby -I../rubygems/lib:../vernier/lib test.rb
{MEAN: 0.https://github.com/rubygems/rubygems/commit/600223749969}
{stddev: 0.https://github.com/rubygems/rubygems/commit/037224226667}
{"mib/s": 23.https://github.com/rubygems/rubygems/commit/324635189326}
```
https://github.com/rubygems/rubygems/commit/e40a153560