refactor the whole damn thing

src/Struct/ItemJSON.js

@@ -0,0 +1,32 @@
+import Item from './Item'
+
+export default class ItemJSON extends Item {
+  constructor () {
+    super()
+    this._content = null
+  }
+  get _length () {
+    return this._content.length
+  }
+  _fromBinary (y, decoder) {
+    let missing = super._fromBinary(y, decoder)
+    let len = decoder.readVarUint()
+    this._content = new Array(len)
+    for (let i = 0; i < len; i++) {
+      this._content[i] = JSON.parse(decoder.readVarString())
+    }
+    return missing
+  }
+  _toBinary (y, encoder) {
+    super._toBinary(y, encoder)
+    let len = this._content.length
+    encoder.writeVarUint(len)
+    for (let i = 0; i < len; i++) {
+      encoder.writeVarString(JSON.stringify(this._content[i]))
+    }
+  }
+  _logString () {
+    let s = super._logString()
+    return 'ItemJSON: ' + s
+  }
+}