As case sensitivity of off by default, I'd keep that as a standard. If case sensitivity is required for e.g. string comparisons, then either use '==' or switch it on temporarily. While NoVarsInStrings and Explicit have usage with regards to the cleanliness of coding in general, CaseSensitivity is more "esoteric" as it applies to just a specific situation of string comparisons.
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There are two types of vessels, submarines and targets.
