Create a Page object.

See #465.
See #464.

sheaf.js

@@ -70,28 +70,17 @@ Sheaf.prototype.heft = function (page, s) {
     this.magazine.get(page.address).adjustHeft(s)
 }
 
-Sheaf.prototype.createLeaf = function (override) {
-    return this.createPage({
-        rotation: 0,
-        loaders: {},
-        entries: 0,
-        ghosts: 0,
-        items: [],
-        right: { address: 0, key: null },
-        queue: this.sequester.createQueue()
-    }, override, 0)
-}
-
-Sheaf.prototype.createPage = function (page, override, remainder) {
+function Page (sheaf, prototype, override, remainder) {
     if (override.address == null) {
-        while ((this.nextAddress % 2) == remainder) this.nextAddress++
-        override.address = this.nextAddress++
+        while (sheaf.nextAddress % 2 == remainder) sheaf.nextAddress++
+        override.address = sheaf.nextAddress++
     }
-    return extend(page, override)
+    extend(this, prototype)
+    extend(this, override || {})
 }
 
 Sheaf.prototype.createBranch = function (override) {
-    return this.createPage({
+    return new Page(this, {
         items: [],
         entries: 0,
         rotation: 0,
@@ -100,6 +89,18 @@ Sheaf.prototype.createBranch = function (override) {
     }, override, 1)
 }
 
+Sheaf.prototype.createLeaf = function (override) {
+    return new Page(this, {
+        rotation: 0,
+        loaders: {},
+        entries: 0,
+        ghosts: 0,
+        items: [],
+        right: { address: 0, key: null },
+        queue: this.sequester.createQueue()
+    }, override, 0)
+}
+
 Sheaf.prototype.splice = function (page, offset, length, insert) {
     ok(typeof page != 'string', 'page is string')
     var items = page.items, heft, removals