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));
    }
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.
Convenience method for {