/**
     * Creates a new map instance whose keys are Class instances. Keys are referenced using strong or weak references, values by strong or other references depending on their usage.
     * This allows the classes to be collected.
     *
     * <p>A map differs from a cache in that entries are not discarded based on memory pressure, but are discarded only when the key is collected.

            return null;
        }
    }

    public static String toLongIdHexString(long key) {
        return String.format("%016X", key).trim();
    }

    public static String toHexString(byte[] fingerprint) {
        return Fingerprint.wrap(fingerprint).toString();
    }

     *
     * @param key the key
     * @param value the value
     */
    void put(K key, V value);

    /**
     * Adds a map entry to the property value.
     *
     * <p>The given provider will be queried when the value of this property is queried.
     * This property will have no value when the given provider has no value.
     *
     * @param key the key

                } catch (MissingPropertyException e) {
                    throw new GradleException(String.format("Missing property (%s) for Groovy template expansion. Defined keys %s.", e.getProperty(), properties.keySet()), e);
                } catch (IOException e) {
                    throw new UncheckedIOException(e);
                }
            }
        });
    }