containers: experimental container syntax

diff --git a/extra/containers/authors.txt b/extra/containers/authors.txt
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+John Benediktsson

diff --git a/extra/containers/containers.factor b/extra/containers/containers.factor
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+USING: accessors assocs deques dlists growable kernel math
+sequences sets ;
+
+IN: containers
+
+GENERIC: count ( obj -- n )
+
+M: sequence count length ;
+M: assoc count assoc-size ;
+M: set count cardinality ;
+
+GENERIC: capacity ( obj -- n )
+
+M: object capacity count ;
+M: growable capacity underlying>> length ;
+
+GENERIC: contains? ( elt obj -- ? )
+
+M: sequence contains? member? ;
+M: assoc contains? key? ;
+M: set contains? sets:in? ;
+M: deque contains? deque-member? ;
+
+GENERIC: items ( obj -- seq )
+
+M: sequence items ;
+M: set items members ;
+M: assoc items >alist ;
+M: dlist items dlist>sequence ;
+
+GENERIC: empty? ( obj -- ? )
+
+M: object empty? count zero? ; inline
+M: dlist empty? front>> not ; inline
+M: deque empty? deque-empty? ; inline
+
+GENERIC: add ( elt obj -- )
+
+M: sequence add push ;
+M: set add adjoin ;
+
+GENERIC: lookup ( key obj -- elt )
+M: sequence lookup nth ;
+M: assoc lookup at ;
+
+! XXX: at ( key obj -- elt ) and of ( obj key -- elt )
+
+GENERIC: remove ( elt obj -- )
+
+M: sequence remove remove-nth! drop ;
+M: set remove delete ;
+
+GENERIC: remove-all ( obj -- )
+
+M: sequence remove-all delete-all ;
+M: assoc remove-all clear-assoc ;
+M: set remove-all clear-set ;
+M: deque remove-all clear-deque ;
+
+GENERIC: like ( obj exemplar -- newobj )
+
+M: sequence like sequences:like ;
+M: assoc like assoc-like ;
+M: set like set-like ;
+
+GENERIC: clone-like ( obj exemplar -- newobj )
+
+M: sequence clone-like sequences:clone-like ;
+M: assoc clone-like assoc-clone-like ;

diff --git a/extra/containers/tags.txt b/extra/containers/tags.txt
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+collections