+HELP: direct-slice
+{ $values { "from" integer } { "to" integer } { "seq" "a specialized array" } { "seq'" "a new specialized array" } }
+{ $description "Constructs a new specialized array of the same type as " { $snippet "seq" } " sharing the same underlying memory as the subsequence of " { $snippet "seq" } " from elements " { $snippet "from" } " up to but not including " { $snippet "to" } ". Like " { $link slice } ", raises an error if " { $snippet "from" } " or " { $snippet "to" } " is out of bounds." } ;
+
+HELP: direct-head
+{ $values { "seq" "a specialized array" } { "n" integer } { "seq'" "a new specialized array" } }
+{ $description "Constructs a new specialized array of the same type as " { $snippet "seq" } " sharing the same underlying memory as the first " { $snippet "n" } " elements of " { $snippet "seq" } ". Like " { $link head } ", raises an error if " { $snippet "n" } " is out of bounds." } ;
+
+HELP: direct-tail
+{ $values { "seq" "a specialized array" } { "n" integer } { "seq'" "a new specialized array" } }
+{ $description "Constructs a new specialized array of the same type as " { $snippet "seq" } " sharing the same underlying memory as " { $snippet "seq" } " without the first " { $snippet "n" } " elements. Like " { $link tail } ", raises an error if " { $snippet "n" } " is out of bounds." } ;
+
+HELP: direct-head*
+{ $values { "seq" "a specialized array" } { "n" integer } { "seq'" "a new specialized array" } }
+{ $description "Constructs a new specialized array of the same type as " { $snippet "seq" } " sharing the same underlying memory as " { $snippet "seq" } " without the last " { $snippet "n" } " elements. Like " { $link head* } ", raises an error if " { $snippet "n" } " is out of bounds." } ;
+
+HELP: direct-tail*
+{ $values { "seq" "a specialized array" } { "n" integer } { "seq'" "a new specialized array" } }
+{ $description "Constructs a new specialized array of the same type as " { $snippet "seq" } " sharing the same underlying memory as the last " { $snippet "n" } " elements of " { $snippet "seq" } ". Like " { $link tail* } ", raises an error if " { $snippet "n" } " is out of bounds." } ;
+
+{ direct-slice direct-head direct-tail direct-head* direct-tail* } related-words
+