Invalid numeric literal in an {% if %} tag is treated as a variable

[Lily]

I would expect the following template to raise a TemplateSyntaxError during parsing:

{% if 1.1.1 %}foo{% endif %}

Instead, the 1.1.1 is treated as a variable name, so this will render an empty string (or "foo" if the context looks like {"1": {"1": {"1": "bar"}}} or similar).