View a list (actually any Sequence) of (key,value) pairs as a Map collection.
This allows to feed sequences into algorithms that require a map without building a full-fledged map.
Most of the time this will be used only when the parameter list is known to be very small, such that
conversion to a Map would be to costly.
Note that this type blatantly violates a lot of properties of the Map class: use with care.