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2da4bc85cf
The javadocs of the CharSequence interface state that not all of its implementations define the general contracts of the Object#equals and Object#hashCode methods, therefore it is dangerous to use different CharSequence instances as elements in a set or as keys in a map. While we probably mostly use Strings in sets, in some places this is not enforced. To prevent this from accidentally happening, this change replaces all occurances of Set<CharSequence> which are currently mostly used in the completion suggester code with the more concrete usage of Set<String>.