Revert "#1065 - change key to hold a string"
Revert "#1065 - change key to hold a string"

This reverts commit 07d19c7cc9a702f51123a619830d85a1ca71ae51.

Conflicts:

	processing.js

kevinb7/processing-js,guazipi/processing-js,jeresig/processing-js,jaredly/processing-js,corbanbrook/processing-js,corbanbrook/processing-js,baiyanghese/processing-js,jeresig/processing-js,jaredly/processing-js,corbanbrook/processing-js,guazipi/processing-js,baiyanghese/processing-js,kevinb7/processing-js