src/mustache_core.js
function HelperOptions(scope, nodeList, exprData, stringOnly) {
	this.metadata = { rendered: false };
	this.stringOnly = stringOnly;
	this.scope = scope;
	this.nodeList = nodeList;
	this.exprData = exprData;
}
function HelperOptions(scope, nodeList, exprData, stringOnly) {
	this.metadata = { rendered: false };
	this.stringOnly = stringOnly;
	this.scope = scope;
	this.nodeList = nodeList;
	this.exprData = exprData;
}
Lazily lookup the context only if it's needed.