Unable to use postProcess with beforeReady

[superlou]

I might be using this wrong, but I noticed that postProcess was never called. Looking inside beforeReady:

tabletop/src/tabletop.js

Lines 545 to 551 in 05163cf

	beforeReady: function() {
	if(this.postProcess) {
	for (i = 0, ilen = this.elements.length; i < ilen; i++) {
	this.postProcess(element);
	}
	}
	},

The first thing is that this doesn't seem to have a postProcess attribute, though this.tabletop.postProcess exists. The following seems to work, though I feel like maybe I'm just using the library incorrectly:

    beforeReady: function() {
      if(this.tabletop.postProcess) {
        for (let i = 0, ilen = this.elements.length; i < ilen; i++) {
          this.tabletop.postProcess(this.elements[i]);
        }
      }
    },