swiftstack / container-crawler / 222

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Handle pre-2.18 Swift releases.

2.18 Swift introduced container sharding and the accompanying helper
methods. As the ContainerCrawler can be used with older versions of
Swift, we have to be careful about calling these methods.

Writing a test for this is a little bit difficult, as we need to have
some set of functional tests that we can execute against arbitrary
versions of Swift.

143 of 158 branches covered (90.51%)

Branch coverage included in aggregate %.

326 of 362 relevant lines covered (90.06%)

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