How to check if a StringComparison is case sensitive?

Given a StringComparison instance, how should I check if it is case sensitive?

Should I compare it to all currently known case sensitive values in the enum?

StringComparison sc = ...;
bool isCaseSensitive = false
    || sc == StringComparison.CurrentCulture
    || sc == StringComparison.InvariantCulture
    || sc == StringComparison.Ordinal;

Yes, for the enum form (StringComparison) that's fine. MS is incredibly unlikely to add another StringComparison value now, given that adding a value to an enum is effectively a breaking change.

For a StringComparer, it's rather harder :(

See more on this question at Stackoverflow