src/main/java/org/apache/commons/collections4/multimap/AbstractMultiValuedMap.java [301:308]:
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    public boolean putAll(final MultiValuedMap<? extends K, ? extends V> map) {
        Objects.requireNonNull(map, "map");
        boolean changed = false;
        for (final Map.Entry<? extends K, ? extends V> entry : map.entries()) {
            changed |= put(entry.getKey(), entry.getValue());
        }
        return changed;
    }
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src/main/java/org/apache/commons/collections4/multimap/TransformedMultiValuedMap.java [179:186]:
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    public boolean putAll(final MultiValuedMap<? extends K, ? extends V> map) {
        Objects.requireNonNull(map, "map");
        boolean changed = false;
        for (final Map.Entry<? extends K, ? extends V> entry : map.entries()) {
            changed |= put(entry.getKey(), entry.getValue());
        }
        return changed;
    }
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