java.util.IdentityHashMap uses reference-equality when comparing keys which
isn’t what a reader would expect if the type of the variable is
Due to this special nature of
IdentityHashMap, we recommend preserving the
type of the variable. This means that we shouldn’t type upcast
to its super classes and always use the default type. This is to make sure that
reader/maintainer of the code is aware about it and takes special consideration
when invoking any method on them.
Suppress false positives by adding the suppression annotation
@SuppressWarnings("IdentityHashMapUsage") to the enclosing element.