libjson-multivalueordered-perl - 0.005-1 main

A hash tied to the JSON::MultiValueOrdered class acts more or less like
a standard hash, except that when you assign a new value to an existing
key, the old value is retained underneath. An explicit delete deletes
all values associated with a key.
.
By default, the old values are inaccessible through the hash interface,
but can be retrieved via the tied object, however, the fetch_* methods
provide a means to alter the behaviour of the hash.