LiquidTypeError when comparing strings

[jg-rp]

Boolean expressions - found in {% if %} and {% unless %} tags - that compare string values with <, <=, > and >= are raising a LiquidTypeError exception.

Comparing strings for equality is OK, but comparing the lexicographic order of strings is broken.

from liquid import Template

t = Template("{% if x <= y %}TRUE{% else %}FALSE{% endif %}")
t.render(x="abc", y="def")
# LiquidTypeError: unknown operator: <class 'str'> < <class 'str'>, on line 1