Shopify/liquid — pull request #372 by benstein (2014-06-23 15:25:47+00:00)
Title: Variable names should be able to start with digits

Contexts may have key names that start with digits, but liquid templates don't support identifier names that start with digits e.g. ```{% if 2013_revenue > 100 %}```
This change to NUMBER_LITERAL regex checks that a number is on a word boundary. If not, it will be considered an identifier