Returns a set of package names that can be searched for {@link HashFormat} implementations according to
heuristics defined in the {@link #getHashFormatClass(string, string) getHashFormat(packageName, token)} JavaDoc.
<h3>Efficiency</h3>
Configuring this property is not as efficient as configuring a {@link #getFormatClassNames() formatClassNames}
map, but it may be more convenient depending on the number of {@code HashFormat} implementations that
need to be supported by this factory.
@return a set of package names that can be searched for {@link HashFormat} implementations
@see #getHashFormatClass(string, string)
Returns a set of package names that can be searched for {@link HashFormat} implementations according to heuristics defined in the {@link #getHashFormatClass(string, string) getHashFormat(packageName, token)} JavaDoc. <h3>Efficiency</h3> Configuring this property is not as efficient as configuring a {@link #getFormatClassNames() formatClassNames} map, but it may be more convenient depending on the number of {@code HashFormat} implementations that need to be supported by this factory.
@return a set of package names that can be searched for {@link HashFormat} implementations @see #getHashFormatClass(string, string)