Shopify/liquid — pull request #135 by astathopoulos (2012-07-13 12:51:43+00:00)
Title: Use array instead of Hash to keep the registered filters

1.8.7 compatibility fix

In Ruby 1.8.7, Hash does not preserve insertion ordering as Array does.
This could cause a problem when registering filters which depend on others and
the registration order is important.

So, the @@filters variable was changed to array where the order of the filters is
the same as the insertion order.