INCOMPATIBLE change: (MAKE-INSTANCE ...) or (NEW ...) of classes GMAP, RBMAP and TMAP
now expect :PRED argument to be the name of a function (i.e. a symbol) instead of a function.

For example, the call (new 'rbmap :test #'fixnum<)
must be replaced with (new 'rbmap :test 'fixnum<)

Unluckily there was no way to maintain compatibility and still implement
fully general serialization/deserialization of GMAP, RBMAP and TMAP
as HYPERLUMINAL-DB is currently start to provide