liquibase-core/src/main/java/liquibase/util/StringClauses.java
public StringClauses insertBefore(String existingKey, String newValue) {
        return insertBefore(existingKey, newValue, StringUtil.trimToNull(newValue));
    }
public StringClauses insertBefore(String existingKey, String newValue) {
        return insertBefore(existingKey, newValue, StringUtil.trimToNull(newValue));
    }
Convenience method for {@link #insertBefore(String, String, String)} where the new clause key is equal to the newValue.