top-level Hash functions more closely mirror Hash() functions

lib/hash.js

@@ -126,6 +126,10 @@ Hash.map = function (ref, f) {
     return Hash(ref).map(f).items;
 };
 
+Hash.forEach = function (ref, f) {
+    Hash(ref).forEach(f);
+};
+
 Hash.filter = function (ref, f) {
     return Hash(ref).filter(f).items;
 };
@@ -134,6 +138,30 @@ Hash.reduce = function (ref, f, acc) {
     return Hash(ref).reduce(f, acc);
 };
 
+Hash.some = function (ref, f) {
+    return Hash(ref).some(f);
+};
+
+Hash.update = function (a, b) {
+    return Hash(a).update(b).items;
+};
+
+Hash.merge = function (a, b) {
+    return Hash(a).merge(b).items;
+};
+
+Hash.valuesAt = function (ref, keys) {
+    return Hash(ref).valuesAt(keys);
+};
+
+Hash.tap = function (ref, f) {
+    return Hash(ref).tap(f).items;
+};
+
+Hash.extract = function (ref, keys) {
+    return Hash(ref).extract(keys).items;
+};
+
 Hash.concat = function (xs) {
     var hash = Hash({});
     xs.forEach(function (x) { hash.update(x) });