Remove defunct commit helper utility.

Closes #501.

cursor.js

@@ -46,8 +46,9 @@ Cursor.prototype.next = cadence(function (async) {
 // to user land
 Cursor.prototype.indexOf = function (key, index) {
     ok(arguments.length == 2, 'index requires two arguments')
+    ok(index === 0 || index === 1, 'unexpected index')
     var page = this._page
-    var index = this._sheaf.find(page, key, index)
+    var index = this._sheaf.find(page, key, 0)
     var unambiguous
     unambiguous = -1 < index // <- todo: ?
                || ~ index < this._page.items.length
@@ -103,7 +104,7 @@ Cursor.prototype._filename = function (page) {
 
 Cursor.prototype.insert = function (record, key, index) {
     ok(this.exclusive, 'cursor is not exclusive')
-    ok(index > 0 || this._page.address == 1)
+    ok(index > 0 || this._page.address == 1 || this._page.ghosts === 1, 'insert at ghost')
 
     this._sheaf.unbalanced(this._page)
 
@@ -112,8 +113,13 @@ Cursor.prototype.insert = function (record, key, index) {
     }
 
     var heft = this._appender.writeInsert(index, record).heft
+    var replace = 0
+    if (index === 0) {
+        this._page.ghosts--
+        replace = 1
+    }
 
-    this._page.splice(index, 0, {
+    this._page.splice(index, replace, {
         key: key,
         record: record,
         heft: heft

release.ft

@@ -14,6 +14,7 @@ The common utility functions are now exported globally. They may move into a uti
 
 ### Issue by Issue
 
+ * Remove defunct commit helper utility. #501.
  * Upgrade Advance and Splice. #498.
  * Upgrade Cadence to 0.0.52. #497.
  * User record serializer in `writeInsert`. #495.

t/proof.js

@@ -177,13 +177,14 @@ function abstracted (dir) {
                 b = b.name.split('.').pop()
                 return +(a) - +(b)
             })
-//            console.log(files.map(function (file) { return file.name }))
+            console.log(files.map(function (file) { return file.name }))
             record = { log: [] }
             var entry = 0
             files.forEach(function (file) {
                 position = 0
+                console.log(file)
                 file.body.forEach(function (line, index) {
-//                    console.log(line)
+                    console.log(line)
                     var json = line.header
                     ok(++entry == json[0], 'entry record is wrong')
                     if (json[1]) {