ProcessValue class doesn't correctly create path for uppercase variables.

[andrewtelnov]

The following code doesn't work correctly:

var processor = new Survey.ProcessValue();
var data = {};
processor.setValue(data, "a.Item1.c1", 1);

After that data equals a: {item1: {c1: 1}}, where item1 should be in capital, a: {Item1: {c1: 1}}.
This error leads to issue in triggers for matrices question, when rows values are in upper case.