templater: store revisions as ints so min/max won't compare them as strings Because a template value has no explicit type (like ancient PHP), ifcontains() has to coerce the type of the needle. Before, it was always converted to a string, which meant any container type should be a list/dict of strings. This no longer works since we've introduced min/max functions. In order to work around the untyped nature of templater, this patch adds a type specifier to hybrid dict/list. It isn't named as "valuetype" since the _hybrid class can also wrap a dict.