public void put(final String key, final V value) {
        Objects.requireNonNull(key);
        put(CIKey.of(key), value);
    }
A map that allows you to perform a lookup in both a case-sensitive and case-insensitive way
<p>
Not thread safe.
</p>
stroom-util/src/main/java/stroom/util/collections/MultiCaseMap.java