.parent and .offset of Buffer and SlowBuffer .prototype throw an exception when accessed

[wraithan]

I was writing a tool to scrape the APIs of everything and stumbled across these in the buffer module.

Repro:

Run the following JS on any version of node/io.js from 3.0.0 until 4.1.2 (current as of time of writing)

var buffer = require('buffer')
buffer.Buffer.prototype.parent
buffer.Buffer.prototype.offset
buffer.SlowBuffer.prototype.parent
buffer.SlowBuffer.prototype.offset

Example output:

buffer.js:311
    if (this.byteLength === 0 ||
            ^

TypeError: Method Uint8Array.byteLength called on incompatible receiver [object Object]
    at Buffer.get byteLength (native)
    at Buffer.Object.defineProperty.get [as parent] (buffer.js:311:13)
    at Object.<anonymous> (/Users/wmcdonald/devel/newrelic/api-scraper/bad-buffer.js:2:24)
    at Module._compile (module.js:434:26)
    at Object.Module._extensions..js (module.js:452:10)
    at Module.load (module.js:355:32)
    at Function.Module._load (module.js:310:12)
    at Function.Module.runMain (module.js:475:10)
    at startup (node.js:118:18)
    at node.js:952:3

CCing @trevnorris since he asked me to.

[trevnorris]

Posted fix, running CI.