private static String fromObject(Object value) {
        final String strVal = StringValueConverter.INSTANCE.convertObject(value);
        assert strVal != null : value + " converted to null.";
        return strVal;
    }
Removes all the entries whose hash code equals {@code h} and whose name is equal to {@code name}.

@return the first value inserted, or {@code null} if there is no such entry.
core/src/main/java/com/linecorp/armeria/common/StringMultimap.java